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2026-01-20 · Baduno Editorial Team · 27 blog.readMin · Blog & Knowledge

Machine Translation Post-Editing: The Honest MTPE Guide

Machine Translation Post-Editing (MTPE) promises efficiency but harbors pitfalls. Our guide shows when Light or Full Post-Editing makes sense, how to properly evaluate texts, and find fair billing models. With practical checklist and ISO-18587-compliant quality assurance – for realistic productivity gains without quality loss.

A human hand refines machine translation output with a pen.

Fundamentals of Machine Translation Post-Editing

Machine Translation Post-Editing (MTPE) refers to the manual revision of machine-translated texts by a human. The goal is to raise the initial quality of the machine translation to a defined final level. The basic idea: instead of creating a translation from scratch, you leverage the pre-work of an AI and optimize it specifically. In practice, this approach can save time – but only if the source text and the desired quality align.

The quality of machine translation depends on several factors: sentence length, specialized terminology, sentence structure, and similarity to the engine's training data. Standard texts such as product descriptions or weather reports often yield usable raw translations, while highly culture-specific or literary texts more frequently contain erroneous passages. During post-editing, you not only correct obvious errors but also adapt idiomatic expressions and reading flow. A typical example: The machine translates “The application runs smoothly” as “Die Anwendung läuft glatt” – you change it to “Die Anwendung läuft stabil” because that is customary in context.

For billing purposes, a clear distinction between Light and Full Post-Editing is necessary. While Light MTPE only provides minimal intervention, Full MTPE is equivalent to a full-fledged translation. It is advisable to test the engine before the project begins: take 500 words of a representative text, have them machine-translated, and evaluate the time required for correction. A ratio of 1:3 (one minute of post-editing for three minutes of new input) serves as a guideline for Light MTPE. If the effort is higher, you should consider using a different engine or switching to Full MTPE.

Concrete recommendation: Define a clear MTPE level for each text type. For internal communication or large content volumes, Light MTPE suffices; for customer communication or legal texts, Full MTPE is appropriate. Conduct a brief onboarding with your translators so that everyone understands the difference between machine errors and stylistic issues. Only then can you realistically measure productivity gains.

MTPE in the Translation Workflow

Machine Translation Post-Editing can be integrated into existing translation processes in various ways. The classic variant is the sequential workflow: The source text is automatically sent through an MT engine, the result lands in a Translation Management System (TMS) and is assigned to a post-editor. They open the file, see the MT suggestions in an editing window, and correct them line by line. In practice, it has proven useful to mark the MT results with colors so that the editor can see where the machine was particularly uncertain – for example, with unknown terms in a translation memory query.

An alternative integration is the interactive mode: The post-editor works in a CAT tool environment that generates machine suggestions in real time. Here, the editor decides whether to accept, reject, or adapt the suggestion. This workflow allows a seamless switch between MTPE and manual translation but requires good configuration of the MT engine and the TMS. Experience shows that this mode is particularly suitable for projects with varying text types, where the editor must react flexibly.

Quality assurance after post-editing is an often underestimated step. Even with Light MTPE, you should provide a second check – either by another linguist or an automated check based on terminology databases. For Full MTPE, a full review by a second translator is recommended. Ensure that your TMS enables time tracking per segment: This allows you to document the actual effort per text type and later factor it into calculations.

Concrete recommendation: Use your TMS to perform a pre-classification of segments. Segments with high recognition value (such as repeated sentences) can be assigned an automatic MT template, while complex segments are created manually. Establish a dedicated quality metric for MTQ (Machine Translation Quality) that you update after each project. This way, you keep track of which engine delivers the best raw quality for which text type.

Red and gold correction marks on a printed text sheet.

Light Post-Editing: Definition and Application

Light Post-Editing is the minimally invasive correction of a machine-generated translation. The goal is to make the text understandable and error-free without refining it stylistically or idiomatically. Interventions are limited to obvious errors such as incorrect translations of technical terms, grammatical mistakes, or inaccurate numbers. The sentence structure is largely preserved – even if it sounds clunky. For example, the machine translation 'Bitte drücken Sie den Knopf, um zu starten' becomes 'Bitte drücken Sie die Taste, um zu starten' in Light MTPE – no more is needed.

Light MTPE is suitable for text types where pure information delivery is paramount and formal design is secondary. Typical use cases include internal process documentation, mass emails, short product descriptions, or forum posts. It is also efficient for first-draft translations that will later be revised by an editor. In practice, Light MTPE saves about 20% to 30% of the time compared to a traditional translation – the exact savings depend heavily on the engine's raw quality and text complexity.

To decide whether a text is suitable for Light MTPE, take a sample first. Have three representative paragraphs machine-translated and assess the number of corrections. If more than 10% of words need editing, Full MTPE or manual translation is likely more appropriate. Also define clear criteria for what counts as an error: terminology errors yes, style improvements no. A checklist based on the TAUS MTPE guidelines helps standardize the scope of interventions.

Concrete recommendation: Create a guideline for your team with examples of Light MTPE. Specify that only factual errors should be corrected, not phrasing like 'aufgrund dessen' changed to 'deshalb'. Conduct a monthly quality check: after Light Post-Editing, have a second editor review the same text for 'understandability'. If understandability remains high, it indicates that Light MTPE is being applied correctly.

Full Post-Editing: When Perfection is Required

Full Post-Editing subjects the raw machine translation to a complete linguistic and technical review. The goal is a final product that meets the quality standards of a traditional human translation. Unlike Light Post-Editing, this involves correcting not only obvious errors but also stylistic nuances, idiomatic expressions, consistent terminology, and adherence to specific style guides. The post-editor works through the entire text sentence by sentence, comparing it with the source text.

In practice, Full Post-Editing is particularly suitable for texts with high quality requirements. These include legal documents, business reports, marketing materials, medical technical texts, or customer correspondence. If a text is published or has legal implications, the effort for a complete revision is usually justified. A real example: the translation of a safety data sheet for chemicals cannot contain inaccuracies – Light Post-Editing would be insufficient here. Experience shows that experienced post-editors need about 70 to 90 percent of the time of a new translation for Full Post-Editing, depending on the language pair and the quality of the raw translation.

As a recommendation for billing, Full Post-Editing should be billed on a time basis or at a fixed word price that reflects the intensive work. We recommend informing the client clearly about the higher effort before starting. Define in writing which quality criteria (e.g., according to a standard like ISO 18587) apply. If in doubt about the suitability of the text type, post-edit a sample of about 500 words and document the time required. Avoid blanket promises – instead, point out the dependency on the quality of the machine template. Legally, be aware that Full Post-Editing can be considered a translation under copyright law; clarify this with your legal counsel if necessary.

Another aspect is combining Full Post-Editing with terminology management. If you feed company-specific glossaries and translation memories into the AI system, the raw quality improves, and the post-editing effort decreases in the medium term. Nevertheless, for demanding texts, Full Post-Editing remains the safe choice when perfection is required.

Suitability of Text Types for Light Post-Editing

Light post-editing is particularly suitable for text types where content is paramount and linguistic perfection is secondary. The goal is an understandable, correct rendition without serious errors of meaning, with style and idiomaticity only superficially adjusted. Experience shows that the following text types benefit most: internal memos, raw data evaluations, draft patent specifications, social media posts, discussion forums, or automatically generated product offers for price comparison portals.

Characteristic of these text types is a high repetition rate or a strongly structured language. Machine translation systems often deliver usable results here that can be corrected with minimal effort. A concrete example: product descriptions in an online shop with thousands of items—here it suffices to transfer measurements, materials, and functions correctly, while the wording does not necessarily have to be creative. Light post-editing can then save 80 percent of the time compared to human translation.

Nevertheless, you should check whether the target audience accepts the lower level of linguistic smoothing. For non-critical texts that are never published (e.g., internal minutes), light post-editing is the most economical solution. As a rule of thumb: the shorter the usage period and the narrower the recipient group, the more appropriate light post-editing is. Ensure that the raw machine translation for these text types is preconfigured with current glossaries to avoid terminology errors from the outset.

For billing, we recommend a percentage discount on the new translation price for light post-editing, e.g., 40 to 60 percent of the usual word rate. Alternatively, you can bill strictly by time (e.g., minutes per word), as the editing speed for light post-editing typically ranges from 1000 to 2000 words per hour. Communicate clearly that after post-editing, the text does not meet the typical publication standard. Obtain written consent from the client if the text is intended for an external purpose—if in doubt, with reference to your company's legal advice.

Suitability of Text Types for Full Post-Editing

Full post-editing is indicated for all text types that require the highest linguistic precision, stylistic consistency, and legal or technical correctness. Experience shows these include: legal contracts, medical device instructions, financial reports, technical safety documentation, marketing texts, websites for country markets, and correspondence with customers or authorities. For these texts, there must be no content gaps or ambiguous formulations, otherwise there is a risk of liability or reputational damage.

The decision for full post-editing also depends on the usage situation. A text that is published or has an external impact should generally undergo the full editing stage. An example: a company's website is localized for entry into a new market. Here it is not enough to correct only gross errors—all texts must be culturally adapted and tailored to the local target audience. Full post-editing then also includes checking formatting, units, and date formats.

Nevertheless, there are criteria that may argue against the use of full post-editing: if the quality of the raw machine translation is very poor (e.g., for highly creative or idiomatically dense source texts), a complete new translation may be more economical. Therefore, always check the source quality with a short test run. We recommend against full post-editing for texts with a proportion of correctable segments below 70 percent. In practice, pre-sorting has proven effective: have the raw translation checked by an automatic quality metric tool to identify risks early.

Legally, you should clarify whether the post-edited product counts as an edited translation and whether you as a translator assume full responsibility. Especially for official or notarial documents, a liability issue may arise. In such cases, obtain a written agreement and consult your legal department. For billing full post-editing, we recommend a word rate close to the new translation price, or time-based billing—with the note that the effort typically ranges from 50 to 80 words per hour.

Hands polishing brass to a shine, as a symbol of text refinement.

Productivity Metrics in the MTPE Workflow

Productivity metrics in the MTPE workflow serve to make the efficiency of the post-editing process measurable and to identify potential for improvement. The most common metrics are words edited per hour (WpH), edit distance as the ratio of changes to the source text, and time savings compared to human translation from scratch. In practice, experienced post-editors often achieve 2,000 to 3,000 words per hour for light post-editing, while for full post-editing the speed drops to 1,000 to 1,500 words. However, these values vary greatly depending on the language pair, text complexity, and quality of the machine translation.

To obtain reliable metrics, we recommend conducting standardized test tasks with representative texts. The time for post-editing should be recorded precisely – ideally via a translation management system (TMS) with integrated time tracking. Additionally, edit distance can be measured using tools such as HTER (Human Translation Edit Rate) to quantify the effort. A practical approach is to document the WpH and the percentage change rate for each job. This way, you can gradually build a data foundation that provides realistic productivity expectations based on text type and client.

For fair billing, two metrics are crucial: the pure editing time and the number of segments requiring no or minimal changes. A model based on time (hourly rate) plus a quality bonus has proven balanced in practice. Avoid flat word rates without considering the actual workload, as light and full post-editing involve very different efforts. Instead, you can introduce tiered rates: e.g., €0.08 per word for light and €0.15 for full, each plus a time buffer for unexpected errors. Regular analysis of productivity metrics helps adjust these rates to market conditions.

Recommendation: Implement monthly reporting with the metrics WpH, edit distance, and time savings. Train your post-editors to track time consistently, and use the data to calculate bids or internal budgets. Review the metrics at least quarterly and adjust billing models if the average quality of machine translation improves. Only in this way will you remain competitive without compromising quality.

Time Measurement and Efficiency Analysis

Precise time measurement is the foundation of any efficiency analysis in the MTPE workflow. It is advisable to record the total processing time for a job and break it down into the phases: preparation, post-editing, and final review. In practice, many language service providers use timer tools that – integrated into the TMS – store the exact time for each segment. You should measure the time for light and full post-editing separately, as the requirements differ significantly. A proven approach is to create a time log for each editing pass that shows how long the editor worked on which segment.

Efficiency analysis compares the measured post-editing time with the time that a human translation of the same text would have required. Experience shows that time savings for light post-editing range between 40% and 60%, and for full post-editing between 20% and 40%. However, these values are highly dependent on the quality of the machine translation. To identify bottlenecks, you should break down time data by text type, language direction, and the MT engine used. For example, post-editing time for legal texts can be twice as high as for general product descriptions, even with the same word count.

To increase efficiency, we recommend combining time measurement with error classification. If, for example, certain error types (e.g., incorrect terminology) require an above-average amount of correction time, you can retrain the MT model specifically or sensitize post-editors to these errors. Additionally, dividing segments into four categories – no change, minimal, medium, and extensive change – helps forecast effort and calculate fair prices. In practice, about 20% of segments typically cause 80% of the post-editing time (Pareto principle).

Recommendation: Implement a standardized time measurement log for each job. Analyze the average time per word for light and full post-editing monthly, broken down by text type. Use the insights to optimize your MT engine and train post-editors specifically. Communicate the measured efficiency gains transparently to your clients – this builds trust and justifies your pricing structure. Remember that time measurement is not an end in itself but serves the continuous improvement of your MTPE workflow.

Quality Assurance According to ISO 18587

The international standard ISO 18587:2017 defines requirements for post-editing of machine translations. It establishes two quality levels: Light (minor changes, comprehensible text) and Full (linguistically and technically flawless). For language service providers offering MTPE, certification according to this standard is an important quality signal. Among other things, the standard requires that post-editors must have demonstrable qualifications—typically a completed translator training program or several years of professional experience in the respective subject area. In addition, the MT systems used must be documented and checked for suitability.

Within the framework of quality assurance according to ISO 18587, a clearly defined review process is required. This includes verifying the post-edited text by a second qualified translator who was not involved in the post-editing. The review is conducted using a uniform error categorization—for example, according to the LISA QA model or the DQF-MDS error classification. Errors are divided into the categories terminology, grammar, style, omissions, and meaning changes. The acceptable error rate is defined by you, depending on customer requirements and text type. For light post-editing, a rate of a maximum of 5 errors per 1000 words can be tolerated; for full post-editing, the limit is virtually zero.

Implementing the standard in practice requires a quality management manual that describes all processes. This includes the selection of the MT engine, instructions for post-editors, time tracking, quality control, and documentation of improvement measures. In practice, it has proven effective to create a quality report for each order that lists the number and type of errors found. This report serves as the basis for customer feedback and internal training. Ensure that all parties involved know and can apply the criteria of ISO 18587—regular workshops are the means of choice here.

Recommendation: Evaluate whether certification according to ISO 18587 is beneficial for your company. It facilitates customer acquisition in regulated industries such as medicine or law. Regardless of certification, implement the required quality checks: a second reviewer, standardized error categories, and documented correction cycles. Train your post-editors specifically in error classification and have samples checked by a senior editor. This ensures that your MTPE workflow meets the high demands of professional translation services.

Machine Translation Post-Editing (MTPE) promises efficiency but harbors pitfalls. Our guide shows when Light or Full Post-Editing makes sense, how to properly evaluate texts, and find fair billing models. With practical checklist and ISO-18587-compliant quality assurance – for realistic productivity gains without quality loss.

Fair Billing Models for Post-Editing

Billing for post-editing services differs fundamentally from traditional translation. While the latter usually uses the target word or line as a basis, MTPE must consider several factors: the quality of the machine pre-translation, the desired editing level (light vs. full), and the text type. A flat word price is rarely fair because the workload varies greatly. Hybrid models that combine a base rate per word with a surcharge for high editing effort have proven effective.

A practical approach is to divide into three effort classes. Class A: low effort when the MT output is already very good and only minimal corrections are needed—about 50-70% of the usual translation price. Class B: medium effort for linguistic or terminological adjustments—70-90% of the translation price. Class C: high effort when MT quality is poor or full post-editing is required—90-110% of the translation price. Classification can be based on metrics such as TER (Translation Error Rate) or a short test segment.

Alternatively, billing by time is an option, especially for complex technical texts. Here, an average hourly rate is set, which also covers familiarization time and quality assurance. However, this requires a trusting collaboration and transparent time tracking. Equally recommended for agencies and freelancers is the definition of minimum prices: since post-editing is often faster than pure translation but still requires expertise, a fair hourly wage should not be undercut.

For fair billing, it is also important to define the scope of post-editing contractually. Does light post-editing include cultural and style adjustments or only pure corrections? For full post-editing, the expected quality level (e.g., ISO 18587) must be precisely specified. Only in this way can renegotiations or conflicts be avoided. A practical tip: before the project starts, present a sample segment and agree on the billing class. This creates transparency and trust.

A human and a machine gear interlock, symbolizing collaboration.

Tools and Techniques for Efficiency Enhancement

Productivity in post-editing largely depends on the tools used. CAT tools with integrated MTPE features, such as displaying translation suggestions from translation memories (TM) and machine translations side by side, speed up the work. Modern systems also offer quality indicators that show the reliability of MT at the word or sentence level. This allows you to focus on problematic areas and quickly confirm safe passages.

Another efficiency gain comes from automating routine tasks. Recurring errors—such as incorrect number formats, inconsistent terminology, or repeated grammar mistakes—can be corrected automatically using regular expressions (regex) or scripts. For example, a script can convert all date formats to the target format or replace incorrectly translated technical terms with the correct terminology. It is important to apply such automations to the entire document in a test run beforehand to rule out unintended changes.

In addition to CAT tools, specialized MTPE plugins or browser extensions facilitate the work. Tools for visual contextualization, such as a live preview mode, show how the translated text appears in the layout. This makes it easier to assess line breaks and space issues. Integrating terminology databases directly into the editor window also saves time. For quality assurance, it is advisable to use QA checkers that once again check for typical errors such as missing spaces or inconsistencies before delivery.

To sustainably increase efficiency, you should regularly analyze your workflows. Time tracking tools like Toggl or Clockify log how long you take for each task. Based on this data, you can optimize your workflow, for example by editing problematic segments first or following a specific order when editing. Small adjustments, such as saving TM entries early, often have a big impact in practice. Invest time in learning your tools—this pays off with every subsequent project.

Pitfalls in the MTPE Process

There are numerous sources of error in post-editing that affect both quality and cost-effectiveness. A common pitfall is overestimating MT quality. Many editors blindly trust the pre-translation and overlook subtle content errors or cultural inconsistencies. For example, neural models often translate idioms literally, which distorts the meaning in the target text. Therefore, even with good MT, you must critically read every segment, especially creative or metaphorical passages.

Another risk is mixing light and full post-editing. Without clear guidelines, editors tend to make more changes than necessary for supposedly simple texts, or vice versa. This leads to inconsistent quality and unnecessary time expenditure. Therefore, define clear criteria for each project: In light post-editing, only grammatical and orthographic corrections as well as major meaning errors are allowed; style and tone are preserved. In full post-editing, everything that is appropriate for the target audience is permitted.

Technical pitfalls concern formatting. Especially with multi-column layouts or heavily formatted documents, MT systems often cause line breaks or list errors. Therefore, after importing into your CAT tool, check the formatting and ensure that placeholders and tags are not altered. A common mistake is deleting a tag, which leads to formatting errors during export. Use a preview function and perform a final layout check.

Difficulties also arise from specific domains and terminology. Machine translations frequently use general rather than specialized terms. A medical text might correctly translate “Herzinfarkt” but ignore the more common technical term “Myokardinfarkt” in the target language region. Therefore, always use a terminology database and adhere to existing glossaries. Consistency with previously translated texts (translation memory) should also be checked. If the TM is not actively used, inconsistencies arise that clients perceive as errors. Ultimately, MTPE, despite the machine, requires a high level of language and subject-matter expertise—do not underestimate this effort.

MTPE Checklist for Practice

A structured checklist helps you ensure consistency and efficiency in the MTPE process. Start with project analysis: Review text type, target audience, and quality requirements. For internal material, social media posts, or repetitive texts, light post-editing is often sufficient. For legal documents, marketing texts, or technical publications, you should plan for full post-editing. Define minimum requirements in advance: Are terminology consistency or brand style guide mandatory? Document these specifications in writing so that all stakeholders share the same expectations.

In the second step, prepare the machine translation. Select an MT system adapted to the domain or optimize the system with glossaries and parallel data. Before starting post-editing, have a second person review a sample of 5–10% of the text – this reveals systematic errors early. Document the most common error types (e.g., mistranslation of technical terms, missing idioms) and share them with the team as a reference.

During post-editing, follow a fixed order: First correct terminology, then syntax and grammar, and finally style and readability. Use tags to make changes traceable – this facilitates later quality control. Measure your processing time per segment: Record start and end for each unit or use a CAT tool with integrated time tracking. This data provides a basis for transparent billing models.

After completing post-editing, conduct a final quality check: Compare the edited text against the initial specifications (go through the checklist again). Is terminology consistent? Have all brand adjustments been implemented? For critical projects, have a second editor proofread the text. Archive your experience: Which errors occurred frequently? Which MT configuration proved effective? With each iteration, you refine your checklist and sustainably increase efficiency.

Outlook: MTPE in the Age of AI and Machine Learning

The development of neural machine translation (NMT) and large language models (LLMs) is fundamentally changing post-editing practice. In the coming years, systems will translate with increasing context awareness – with a better understanding of pragmatic nuances and specialized terminology. This could reduce the effort for full post-editing on certain text types, while light post-editing suffices for ever more formats. At the same time, quality expectations rise: Companies often demand consistent brand language for customer contact, which cannot be achieved by NMT alone.

A promising development is adaptive MT: Systems learn from your post-editing decisions in real time and dynamically adjust their translations. In practice, this means: The more you correct, the more accurate the initial translation becomes for future segments. However, this requires continuous quality assurance, as the system can also learn systematic errors. Therefore, remain critical and regularly check the MT output for unwanted patterns.

The role of the post-editor is also changing. Instead of pure correction work, the control and optimization of the MT system moves to the foreground. You increasingly become an "MT expert" who analyzes error patterns, maintains glossaries, and curates training data. Tools with integrated collaboration (such as comment functions or versioning) are becoming standard. Billing could be based more on quality points or per word with complexity factors instead of pure time measurement.

For companies, it is advisable to invest in competence building early on: Train your post-editors in the use of adaptive systems and error analysis. Develop internal standards that leverage the strengths of MT while deploying human correction purposefully. The trend is toward hybrid workflows: AI creates the raw text, humans validate and refine. Those who master this symbiosis will work more competitively in the long term – without compromising language quality. Always seek advice from your legal team on liability issues, especially with AI-generated content.

Step-by-Step Practical Example of an MTPE Project

To illustrate the MTPE process, let's consider a concrete example: localizing a 5,000-word product description for an online shop from English to German. The source text consists of technical specifications and marketing copy – suitable for light post-editing (see chapter on suitability). The workflow comprises five steps:

1. **Preparation and Analysis**: First, the source text is checked for terminology and style templates. A glossary and previous translations are loaded into the tool (e.g., a CAT tool with MT integration). The MT engine is trained on the specific domain if possible. In practice, this step takes about 30 minutes.

2. **Machine Translation**: The entire text is translated in one pass by the MT. The output appears segment by segment in the CAT tool. For 5,000 words, the engine takes just a few seconds. An initial look at the raw translation reveals typical errors: incorrect prepositions, inconsistent terminology, and literal translations of phrases.

3. **Light Post-Editing**: The post-editor works on the MT output. The goal is semantic correctness and comprehensibility, not stylistic elegance. In practice, about 60% of segments can be accepted without changes. For the remaining 40%, minimal corrections are needed: e.g., replacing technical terms (“actuator” → “Stellantrieb” instead of “Aktor”) or reordering sentence elements. An experienced editor manages about 700 words per hour, so this step requires approximately 7 hours of work.

4. **Quality Assurance**: A second person checks 10–20% of the edited text on a random basis. Typical errors such as missing articles or incomplete translations are uncovered. Corrections are fed back into the project. QA takes about 1.5 hours.

5. **Approval and Delivery**: The client receives the file in the desired format (e.g., XML, XLIFF). After completion, corrections are written to the translation memory (TM) and the MT engine is updated with the corrected segments. The total effort in this example is about 9 hours of pure editing time – significantly less than a manual re-translation (approx. 15–20 hours). The client saves time and costs without sacrificing functional correctness.

This example illustrates how MTPE works in practice. Actual times vary depending on text type, MT quality, and individual pace. It is advisable to measure your own times in operations to obtain realistic planning values.

Collaboration with Translation Service Providers: Requirements and Alignment

MTPE projects require close collaboration between client and service provider. Unlike pure human translation, clear specifications regarding MT usage and post-editing level are necessary. The following aspects should be contractually and operationally defined:

**Definition of Post-Editing Level**: The client must specify whether light or full post-editing is desired. This sets the correction effort and quality expectation. In practice, a written agreement is recommended, e.g., “Light post-editing: The text must be semantically correct and comprehensible; slight stylistic imperfections are acceptable.” Without this definition, editors often correct too much or too little.

**Provision of Reference Materials**: Terminological lists, style guides, and previous translations are essential for training the MT engine and ensuring consistent corrections. Before project start, the service provider should conduct a brief assessment of MT quality using the provided materials. If the MT performs poorly, the client can choose between a different engine or a partial post-editing solution.

**Communication of Corrections**: After post-editing, the client typically receives an export file. Many service providers offer to deliver a difference report (“Track Changes”) showing the changes made to the MT output. This helps the client understand the quality of the editing and provide feedback if necessary.

**Liability and Quality Assurance**: The service provider should work in accordance with ISO 18587 (see chapter on quality assurance). The contract may stipulate random checks and repetition rates. In practice, it has proven beneficial for the client to request a full review of the first delivery for initial projects before switching to sampling.

**Data Privacy and Confidentiality**: MT engines often operate in the cloud. The client must ensure that the service provider does not use the data for its own purposes or share it with third parties. A nondisclosure agreement (NDA) and clauses regarding deletion after project completion are common.

A common client objection is: “Why should I pay for MT when I can use the machine myself?” The answer: A service provider brings expertise, consistency checks, and quality assurance that a mere MT output does not deliver. Collaboration with an experienced post-editor elevates MT quality to a publishable level – at significantly lower costs than a full human translation. For both sides, transparent expectation alignment is worthwhile to avoid misunderstandings and rework.

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Does the compensation for light and full post-editing differ significantly?

Yes, the compensation varies depending on the effort. For Light Post-Editing, the hourly rate is usually lower because only major errors are corrected. Full Post-Editing requires higher rates, as the translation must be linguistically and technically perfect. Clarify with your provider whether billing is based on time or word count (with a reduced base price). Seek legal advice from your legal counsel for the contractual structure.

Which text types are suitable for Light Post-Editing?

Light Post-Editing is ideal for internal notes, drafts, or mass texts such as product lists. Social media posts or newsletters with low quality requirements also benefit. Prerequisite: the machine output is understandable and requires only minimal corrections of terminology or grammar. Complex technical texts or marketing material, on the other hand, require Full Post-Editing, as nuances and style are crucial.

How do I measure productivity in the MTPE workflow?

Measure the number of post-edited words per unit of time, e.g., 2,000–4,000 words per hour for light post-editing. Also document the number of errors before and after editing. Tools such as CAT programs with statistics functions can help. Note that productivity depends on text complexity, machine quality, and individual experience. Conduct regular tests to obtain realistic benchmarks for your team.

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