This paper describes the user's view of the PECAN family of program development systems. PECAN is a program development system generator for algebraic programming languages. The program development systems it produces support multiple views of the user's program, its semantics, and its execution. The program views include a syntax-directed editor, a declaration editor, and a structured flow graph editor. The semantic views include expression trees, data type diagrams, flow graphs, and the symbol table. Execution views show the program in action and the stack contents as the program executes. PECAN is designed to make effective use of powerful personal machines with high-resolution graphics displays and is currently implemented on APOLLO workstations.