最病 以引言 5 n Every software element is intended to satisfy a certain goal, for the benefit of other software elements (and ultimately of human users) n This goal is the elements contract. a The contract of any software element should be 口 Explicit. a Part of the software element itself Institute of Computer Software 2021/1/30 Nanjing University引言  Every software element is intended to satisfy a certain goal, for the benefit of other software elements (and ultimately of human users).  This goal is the element’ s contract.  The contract of any software element should be  Explicit.  Part of the software element itself. 2021/1/30 Institute of Computer Software Nanjing University 5