REFSQ-JP 2021: REFSQ 2021 joint proceedings of the co-located events
: joint proceedings of REFSQ 2021 workshops, OpenRE, Poster and Tools Track, and Doctoral Symposium, co-located with the 27th International Conference on Requirements Engineering: Foundation for Software Quality (REFSQ 2021) : Essen, Germany, April 12, 2021