The research identified and explored the shared knowledge among the instructional multimedia design and development experts comprising of subject matter expert, graphic designer and instructional designer. The knowledge shared by the team was categorized into three groups of multimedia design principles encompasses of basic principles, authoring principles and design principles. The research focused on soliciting knowledge of agreement on the principles. The research design sequentially began with the modified Delphi technique which involved twelve experts in selecting the list of principles in multimedia design. Next phase, the interview session involved three selected experts to verify the list of principles and obtain detailed information. Outcome of the research is essential in providing description of the cognitive skills needed to perform tasks in multimedia design and development proficiently.