AgentSheets (1995)

Agentsheets use a graphical rule-based programming. It is a revolutionary tool that lets anyone create interactive simulations through a user-friendly drag and drop interface. Running simulations is an effective means of learning, but creating your own simulations challenges you to develop a thorough knowledge and understanding of your own ideas about a subject. Designing your agents' behavior and setting the conditions they encounter gives rise to questions you might otherwise overlook. Running your simulation will often prompt you to come up with new theories and scenarios.