The JAD process involves collaboration between various participants in software development. JAD sessions are meetings where participants exchange requirements and specifications to understand the SDLC. JAD participants include project managers, end users, and IT specialists. The JAD method principles are that those working on a project have the best understanding, IT and business specialists provide different expertise, and systems and processes are interdependent. Advantages of JAD include effective participation, understanding objectives, shorter completion times, and commitment to success.