This thesis describes the design, specification, implementation and experience of the use of an interactive flowcharting technique for communicating and realizing algorithms. Our goals are: 1) to help novices to understand computers, by giving them a framework for organizing algorithms, and 2) to support development of software produced by groups of people over an extended period of time. Based on the notions of Dimensional Flowcharts, a system called the DIMsystem has been developed for handling structured flowcharts. The DIMsystem consist of different modules for creating, manipulating and communicating dimensional flowcharts. The current research implementation is in Pascal and runs on a VAX/VMS computer system.