1. A method of representing a program specification, of an advanced functional language, and program execution in a cell format, comprising: communicating with a display device connected to a process device, accessing a cell frame containing multiple cells displayed on said display device, displaying text and icons in said cell frame, associating selected variables and corresponding definitions in said program specification wit cells in said cell format, determining values of said selected variables by executing said program specification, and displaying in cells, associated with said selected variables, an indication value determined by an indication function representing values of said selected variables.