This book takes a systematic approach to problem definition, generation of alternative solutions, analysis, and selection of the preferred solution. The book introduces fundamental terms needed to think systematically and undertake systematic problem solving and covers individual and group problem solving. It discusses the selection of the preferred solution involves decision making and fundamental concepts of decision making, including decision making in the presence of multiple criteria and uncertainty. The treatment embodies decision making for sustainability, with its blend of economics, social, and environmental considerations.