Challenge: a recent study shows that human evaluation is the best way to rank natural language generation systems . human raters can exhibit different behaviors when rating outputs, causing ranking to be unstable . stability is the degree to which a specific evaluation methodology produces the same system ranking when repeated.
Approach: They propose to evaluate results through the lens of stability: stability is the degree to which a specific evaluation methodology produces the same system ranking when repeated.
Outcome: The proposed model is based on a dataset of multi-segment translations rated by multiple professionals . human raters can exhibit different behaviors when rating NLG outputs, the study shows .

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Refined Assessment for Translation Evaluation: Rethinking Machine Translation Evaluation in the Era of Human-Level Systems (2025.findings-emnlp)

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Challenge: Currently, traditional evaluation methods struggle to detect subtle translation errors.
Approach: They propose to use a dataset of human evaluations for English–Russian translations created by professional linguists to enable consistent and rich annotation.
Outcome: The proposed protocol allows expert assessments without time pressure to yield substantially different results from standard evaluations.
Experts, Errors, and Context: A Large-Scale Study of Human Evaluation for Machine Translation (2021.tacl-1)

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Challenge: a large study of machine translation systems shows poor evaluation procedures can lead to erroneous conclusions.
Approach: They propose an evaluation methodology grounded in explicit error analysis based on the Multidimensional Quality Metrics framework.
Outcome: The proposed evaluation methodology outperforms crowd workers in two languages . it shows that human-based metrics outperformed crowd workers .
How Good Are LLMs for Literary Translation, Really? Literary Translation Evaluation with Humans and LLMs (2025.naacl-long)

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Challenge: Recent research has focused on literary machine translation (MT) but evaluation of literary MT remains an open problem.
Approach: They propose a paragraph-level parallel corpus containing verified human translations and 13k evaluated sentences across four language pairs.
Outcome: The proposed corpus compares human evaluations with students and professionals . it shows that the adequacy of human evaluation is controlled by two factors .
MQM Re-Annotation: A Technique for Collaborative Evaluation of Machine Translation (2026.acl-long)

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Challenge: a critical component of machine translation model development is evaluating model quality.
Approach: They propose a two-stage version of the current translation evaluation paradigm (MQM) they propose re-annotation, which uses raters to review and edit annotations .
Outcome: The proposed method improves annotation quality by finding errors missed in the first pass.
Enhancing Human Evaluation in Machine Translation with Comparative Judgement (2025.acl-long)

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Challenge: Human evaluation is crucial for assessing rapidly evolving language models but is influenced by annotator proficiency and task design.
Approach: They evaluate three annotation setups to integrate comparative judgment into human annotation for machine translation.
Outcome: The proposed approach improves inter-annotator agreement and stability of the annotations.
Data Sampling and (In)stability in Machine Translation Evaluation (2023.findings-acl)

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Challenge: a recent data sampling method skews the annotated data toward shorter documents, not necessarily representative of the full test set.
Approach: They examine different approaches to human evaluation and ranking of machine translation systems at the conference on machine translation . they propose a method that uses available labour budget to sample data in a more representative manner .
Outcome: The proposed method improves representation of document lengths and produces stable rankings of translation quality.
ConSiDERS-The-Human Evaluation Framework: Rethinking Human Evaluation for Generative Large Language Models (2024.acl-long)

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Challenge: In this position paper, we argue that human evaluation of generative large language models (LLMs) should be a multidisciplinary undertaking that draws upon the insights from disciplines such as user experience research and human behavioral psychology to ensure that the results are reliable.
Approach: They propose a framework for human evaluation of generative large language models that takes into account usability, aesthetics and cognitive biases.
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Has Machine Translation Evaluation Achieved Human Parity? The Human Reference and the Limits of Progress (2025.acl-short)

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Challenge: In machine translation evaluation, metric performance is assessed based on agreement with human judgments.
Approach: They incorporate human baselines into the MT meta-evaluation to gain a clearer understanding of metric performance and establish an upper bound.
Outcome: The results suggest human parity, but there are several reasons to caution .
Multi-Dimensional Machine Translation Evaluation: Model Evaluation and Resource for Korean (2024.lrec-main)

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Challenge: Existing studies on MT evaluation characterize quality of output with a single number . a recent advancement in MT technologies has enabled higher-quality, more nuanced translations .
Approach: They propose a 1200-sentence MQM evaluation benchmark for English-Korean and a reference-free QE setup to evaluate the quality of the translations.
Outcome: The proposed model outperforms the existing model in style and accuracy.
Tangled up in BLEU: Reevaluating the Evaluation of Automatic Machine Translation Evaluation Metrics (2020.acl-main)

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Challenge: Existing methods for judging metrics are sensitive to the translations used for evaluation, leading to falsely confident conclusions about a metric’s efficacy.
Approach: They propose a method for thresholding performance improvement under an automatic metric against human judgements by using a pairwise system ranking method.
Outcome: The proposed method allows quantification of type I versus type II errors incurred, i.e., insignificant human differences in system quality that are accepted, and significant human differences that are rejected.

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