Interactive simulations hold great potential as a communication vehicle capable of improving the usefulness of technology in education. While some benefit can be gained by simply using pre-built simulations, learners benefit most from designing all or at least some aspects of their own simulations. The challenge is to enable this design-as-learning activity without turning students into programmers. A component-based approach cannot only simplify the design of interactive simulations but at the same time serves as collaboration-enabling technology connecting students, teachers, publishers, and researchers. A general framework called the Use & Design Spectrum is introduced to conceptualize collaboration issues of simulation use and design. The AgentSheets simulation-authoring tool is used to provide specific examples of collaborations.