s3.4.1 Adaptation Learning: Terms Terms Definitions E-environment; P-performance; Ssystem; T-time span. E changes while P stays in a prescribed range, s is then stable S changes while p stays in a prescribed range s is reliable. e structure of s changed while p is still satisfactory, s is said adaptive E changed and p meets requirements after t, s is said a learning system Structure changed yet p meets requirements after T, s is said a self-repaired system.§3.4.1 Adaptation & Learning: Terms Terms & Definitions E changes while P stays in a prescribed range, S is then stable. S changes while P stays in a prescribed range, S is reliable. E & structure of S changed while P is still satisfactory, S is said adaptive. E changed and P meets requirements after T, S is said a learning system. Structure changed yet P meets requirements after T, S is said a self-repaired system. E—environment; P—performance; S—system; T– time span