The book "Intelligent and Evolutionary Systems" is a collection of contributions presented at the 19th Asia Pacific Symposium on Intelligent and Evolutionary Systems (IES 2015) in Bangkok, Thailand. This conference, held annually since 1997, aims to bring together researchers from the Asia-Pacific region and beyond to exchange ideas, present current results, and discuss potential collaborations. The focus of IES 2015 was on the theme "Transforming Big Data into Knowledge and Technological Breakthroughs," highlighting the relevance and timeliness of the topics addressed. The event was organized by the School of Information Technology at King Mongkut's University of Technology Thonburi and received technical support from the International Neural Network Society. The book provides valuable insights into the latest developments in the fields of intelligent systems and evolutionary computation.