Challenge: Multiple-choice MRC is one of the most studied tasks in MRC due to the convenience of evaluation and the flexibility of answer format.
Approach: They propose to use multiple-choice MRC to explain a trained model and reveal how it arrives at the prediction by punishing illogical attributions.
Outcome: The proposed method improves model performance without external information and model structure change without any external information.

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Benchmarking Machine Reading Comprehension: A Psychological Perspective (2021.eacl-main)

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Challenge: MRC is a task that tests the ability of a machine to read and understand unstructured text.
Approach: They propose a theoretical basis for the design of MRC datasets based on psychology and psychometrics and propose shortcut-proof questions and explanations as a part of the task design.
Outcome: The proposed datasets should evaluate the model's ability to understand context-dependent situations and ensure substantive validity by shortcut-proof questions and explanation as a part of the task design.
A Multi-answer Multi-task Framework for Real-world Machine Reading Comprehension (D18-1)

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Challenge: Existing models of machine reading comprehension (MRC) are based on cloze style questions or crowdworkers given a short passage from well-edited sources.
Approach: They propose a multi-answer multi-task framework that uses multiple reference answers for multiple questions.
Outcome: The proposed model increases the ROUGE-L score on the DuReader dataset from 44.18, the previous state-of-the-art, to 51.09 .
A Framework for Evaluation of Machine Reading Comprehension Gold Standards (2020.lrec-1)

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Challenge: Existing literature on machine reading comprehension (MRC) data is limited on the data design of gold standards.
Approach: They propose a framework to investigate linguistic features, lexical cues and ambiguity in MRC gold standards.
Outcome: The proposed framework investigates the present linguistic features, required reasoning and background knowledge and factual correctness on the one hand, and the presence of lexical cues as a lower bound for the requirement of understanding on the other.
HRCA+: Advanced Multiple-choice Machine Reading Comprehension Method (2022.lrec-1)

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Challenge: Multiple-choice question answering (MCQA) requires a model to understand natural languages and understand textual representations.
Approach: They propose a model that uses human reading comprehension attention to increase accuracy for machine reading comprehension.
Outcome: The proposed model outperforms state-of-the-art models on the Semeval-2018 Task 11 dataset and on the DREAM dataset.
GCRC: A New Challenging MRC Dataset from Gaokao Chinese for Explainable Evaluation (2021.findings-acl)

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Challenge: Existing machine reading comprehension datasets lack an explainable evaluation of systems' reasoning capabilities.
Approach: They propose a dataset with multi-choice questions that evaluates MRC systems' reasoning process . they use sentence-level relevant supporting facts, error reason of distractors to evaluate MRC .
Outcome: The proposed dataset is more challenging and useful for identifying limitations of existing MRC systems in an explainable way.
Answer Span Correction in Machine Reading Comprehension (2020.findings-emnlp)

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Challenge: Existing MRC systems produce only partially correct answers when presented with answerable questions.
Approach: They propose a method that yields statistically significant performance improvements over existing MRC systems.
Outcome: The proposed method yields statistically significant performance improvements over state-of-the-art MRC systems in monolingual and multilingual evaluation.
Improving Machine Reading Comprehension with General Reading Strategies (N19-1)

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Challenge: Recent studies have shown that reading strategies improve comprehension levels for readers lacking adequate prior knowledge.
Approach: They propose three general strategies to improve machine reading comprehension (MRC) by fine-tuning a pre-trained model with strategies and a target task.
Outcome: The proposed models improve non-extractive machine reading comprehension (MRC) on the largest general domain multiple-choice dataset RACE.
A Self-Training Method for Machine Reading Comprehension with Soft Evidence Extraction (2020.acl-main)

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Challenge: Existing models for machine reading comprehension lack evidence labels for training models.
Approach: They propose a method which supervises the evidence extractor with auto-generated evidence labels in an iterative process.
Outcome: The proposed method improves on three MRC tasks on seven datasets.
Multi-Passage Machine Reading Comprehension with Cross-Passage Answer Verification (P18-1)

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Challenge: Recent years have seen rapid growth in the MRC community . MRC is believed to be a crucial step in building a general intelligent agent .
Approach: They propose an end-to-end neural model that enables multiple passages to verify each other based on their content representations.
Outcome: The proposed model outperforms the baseline on the English MS-MARCO dataset and the Chinese DuReader dataset, and achieves state-of-the-art performance on both datasets.
Machine Reading Comprehension using Case-based Reasoning (2023.findings-emnlp)

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Challenge: Current state-of-the-art machine readers do not support case-based reasoning .
Approach: They propose a method that extracts a set of similar cases from a nonparametric memory and then predicts an answer by selecting the span in the test context that is most similar to the contextualized representations of answers.
Outcome: The proposed method outperforms baselines on NaturalQuestions and NewsQA by 11.5 and 8.4 EM.

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