Abstract: Starting with production systems which is highly similar to the nature of human thinking, this paper analyzes the limitation of information processing theory in cognitive psychology, and puts forward a concept of finitely related clusters in human thinking process and a member system model (MS), which is based on this concept and supports general, parallel, especially distributed, and cooperative AI problem solving. A concurrent member system programming language MS-1 based on the nondeterministic member system model is introduced from its design consideration, basic architecture, grammatical rules, communication primitive and working mechanism.