High Maintainability Very Critical Maintainability is the characteristics of the software, its history, and associated environments that affect the maintenance process and are indicative of the amount of effort necessary to perform maintenance changes. It can be measured as a quantification of the time necessary to make maintenance changes to the product.[IEEE90-610.12, Hagemeister92] AND Both softgoals of high source code and documentation quality must be satisficed for a system to have high maintainability. A software system with clear source code but bad documentation will be hard to maintain, since maintainers will need to study requirements and design documents in order to understand how the system works. A software system with clear documentation but badly-written code will also be hard to maintain, since maintainers will need to understand how the source code works in order to make changes to it. Thus, software developers must try to satisfice both softgoals in a system. High Souce Code Quality Check [Hagemeister92]. High Documentation Quality Check [Arthur89]. Good Performance Very Critical AND Both softgoals of good time and space performance must be satisficed for a system to achieve good performance. It is inconceivable for a system which is fast but makes bad memory-utilization to be characterized by good performance. It is also inconceivable for a system which makes good memory-utilization but is slow to be characterized by good performance. Thus, software developers must try to satisfice both softgoals in a system. If there is a tradeoff involved between achieving both of them then that tradeoff must be balanced. Good Time Performance Check [Patterson]. Good Space Performance Check [Patterson].