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This paper presents a description of some of the problems encountered in the design of space systems and discusses some of the approaches, considerations, and analytic tools which may be useful in solving those problems. The techniques and problems to be discussed are; reliability estimation, weight-reliability tradeoffs, and spares and redundancy considerations. The analytic approaches discussed are meant to be representative of the types of analysis available and are used to illustrate some of the techniques which have been satisfactorily used on space programs.

This paper presents the results of a planned program to investigate step-stress-to-failure testing as a technique for design improvement and reliability evaluation of electronic equipment. The test philosophy is presented along with a discussion of the test set-up, method of data analysis, implications from test results, and advantages over present failure rate type testing. The implications and recommendations made are based on an actual test-to-failure performed on an item of modular electronic equipment.