Communications in Computer and Information Science

This book constitutes the refereed proceedings of the 21st International Conference on Knowledge Management and Acquisition for Intelligent Systems, PKAW 2025, held in Wellington, New Zealand, during November 17–18, 2025. The 11 full papers and 3 short papers included in this book were carefully reviewed and selected from 25 submissions. These papers focus on advanced research in machine learning, natural language processing, and intelligent systems.