This book constitutes the proceedings of the 26th International Working Conference on Requirements Engineering - Foundation for Software Quality, REFSQ 2020, which was due to be held in Pisa, Italy, in March 2020.

Requirements Specification.- How do Quantifiers Affect the Quality of Requirements?.- Generation of Formal Requirements from Structured Natural Language.- Using Eye Tracking Data to Improve Requirements Specification Use.- Requirements Documentation.- Hearing the Voice of Software Practitioners on Causes, Effects, and Practices to Deal with Documentation Debt.- Innovation Workshop Documentation for Following Software Engineering Activities.- Industrial Practices on Requirements Reuse: An Interview-based Study.- Privacy and Legal Requirements.- Disambiguating Requirements through Syntax-Driven Semantic Analysis of Information Types.- On Understanding How Developers Perceive and Interpret Privacy Requirements Research Preview.- A Methodology for Implementing the Formal Legal-GRL Framework: A Research Preview.- Stakeholders Feedback and Training.- Towards Integrating Data-Driven Requirements Engineering into the Software Development Process: A Vision Paper.- Identifying and Classifying User Requirements in Online Feedback via Crowdsourcing.- Designing a Virtual Client for Requirements Elicitation Interviews.- Agile Methods and Requirements Comprehension.- Explicit Alignment of Requirements and Architecture in Agile Development.- Applying Distributed Cognition Theory to Agile Requirements Engineering.- Automatic Word Embeddings-Based Glossary Term Extraction from Large-Sized Software Requirement.- Requirements Modelling.- Conceptualizing Requirements Using User Stories and Use Cases: A Controlled Experiment.- A Semi-Automated Approach to Generate an Adaptive Quality Attribute Relationship Matrix.- Evaluating the Effects of Different Requirements Representations on Writing Test Case.- Requirements Visualization.- Vision Meets Visualization: Are Animated Videos an Alternative?.- Requirements Assessment in Smart City Districts: A Motivation Concept for Citizens.- Visualizing Feature-Level Evolution in Product Lines: AResearch Preview.

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