This present book includes a set of selected revised and extended versions of the best papers presented at the 16th International Joint Conference on Computational Intelligence (IJCCI 2024) and the 1st International Conference on Explainable AI for Neural and Symbolic Methods (EXPLAINS 2024)—held in Porto, Portugal, from November 20 to 22. The authors focus on three outstanding fields of computational intelligence and, additionally, the explainable AI field. Besides presenting the recent advances of the selected areas, the book aims to aggregate new and innovative solutions for confirmed researchers and on the other hand to provide a source of information and/or inspiration for young interested researchers or learners in the ever expanding and current filed of computational intelligence and explainable AI. It could constitute a precious provision of knowledge for individual researchers as well as represent a valuable sustenance for collective use in academic libraries (of universities and engineering schools) relating innovative techniques in various fields of applications.