Acceptance of redundancy reduction as a practical method of bandwidth and/or power conservation is a significant tread in aerospace communication and telemetry. Techniques for accomplishing data compression are discussed, examples of performance are given, and a machine design for aerospace vehicle use is described. Methods of achieving greater flexibility by combining the redundancy reduction techniques with an electronically programmable telemetry system are discussed. Application of these techniques to other data management problems is also described. A list of relevant publications is provided.