In this monograph some stability properties of linear, time-variant, discrete-time systems are summarized, where some properties are well known, some are little-known facts, and a few may be new. Models for this treatise an the asymp totical behaviour of solutions of difference equations are the commonly known excellent books of CESARI 3] and CONTI 5]. In the tables of Chapter 1 the definitions and the essen tial statements an stability of discrete-time systems are summarized, such that Chapter 2 to 5 may be regarded as explaining appendices for these tables. I am grateful to Paul Ludyk,...