Challenge: Answering non-factoid questions (NFQs) is a challenging task, requiring passage-level answers that are difficult to construct and evaluate.
Approach: They propose a multi-document NFQA benchmark built on WikiHow, a website dedicated to answering “how-to” questions.
Outcome: The proposed framework includes 11,746 human-written answers along with 74,527 supporting documents.

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Challenge: Documents are fundamental to preserving and disseminating information, often incorporating complex layouts, tables, and charts that pose significant challenges for automatic document understanding (DU).
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RoMQA: A Benchmark for Robust, Multi-evidence, Multi-answer Question Answering (2023.findings-emnlp)

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Challenge: Existing QA models are not robust to variations in question constraints, but can be made more robust by tuning on clusters of related questions.
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WildDoc: How Far Are We from Achieving Comprehensive and Robust Document Understanding in the Wild? (2025.emnlp-main)

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Challenge: Existing benchmarks for document understanding in the wild are based on scanned or digital documents . however, these benchmarks fail to capture the challenges posed by documents in the real world .
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ASQA: Factoid Questions Meet Long-Form Answers (2022.emnlp-main)

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Challenge: Recent progress on factoid question answering (QA) does not easily transfer to the task of long-form QA where the goal is to generate detailed explanations.
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FanOutQA: A Multi-Hop, Multi-Document Question Answering Benchmark for Large Language Models (2024.acl-short)

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Challenge: Existing benchmarks for large language models focus on intradocument dependencies or dependencies between a small number of documents.
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HotpotQA: A Dataset for Diverse, Explainable Multi-hop Question Answering (D18-1)

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Challenge: Existing question answering (QA) datasets fail to train QA systems to perform complex reasoning and provide explanations for answers.
Approach: They propose a new dataset with 113k Wikipedia-based question-answer pairs with four key features: (1) the questions require finding and reasoning over multiple supporting documents to answer; (2) the questions are diverse and not constrained to any pre-existing knowledge bases or knowledge schemas; (3) the questions provide sentence-level supporting facts required for reasoning; and (4) a type of factoid comparison questions to test QA systems’ ability to extract relevant facts and perform necessary comparison.
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CausalQA: A Benchmark for Causal Question Answering (2022.coling-1)

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Challenge: Existing causal question answering datasets are relatively small and only include one type of causal question.
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ComQA: A Community-sourced Dataset for Complex Factoid Question Answering with Paraphrase Clusters (N19-1)

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Challenge: ComQA dataset captures question phenomena and the diverse ways in which they are formulated.
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IfQA: A Dataset for Open-domain Question Answering under Counterfactual Presuppositions (2023.emnlp-main)

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Challenge: Existing open-domain QA tasks focus on questions whose answer can be deduced directly from global factual knowledge.
Approach: They propose a dataset where each question is based on a counterfactual presupposition via an "if" clause.
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LINKAGE: Listwise Ranking among Varied-Quality References for Non-Factoid QA Evaluation via LLMs (2024.findings-emnlp)

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Challenge: Non-factoid (NF) question answering is challenging to evaluate due to diverse potential answers and no objective criterion.
Approach: They propose a listwise NFQA evaluation approach that uses Large Language Models to rank candidate answers in a descending list of reference answers sorted by descending quality.
Outcome: The proposed method has higher correlations with human annotations than standard methods.

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