IWESQ 2023 & QuASoQ 2023 Joint Proceedings of 5th International Workshop on Experience with SQuaRE Series and Its Future Direction (IWESQ 2023) 11th Workshop on Quantitative Approaches to Software Quality (QuASoQ 2023) co‐located with APSEC 2023 Seoul, South Korea, December 4th, 2023 Editors: Tsuyoshi Nakajima, Shibaura Institute of Technology, Tokyo, Japan Toshihiro Komiyama, NEC Corporation, Tokyo, Japan Horst Lichter, RWTH Aachen University, Germany Thanwadee Sunetnanta, Mahidol University, Thailand Toni Anwar, Universiti Teknologi Petronas (UTP), Malaysia