By Andreas Mitschele-Thiel
This uniquely functional consultant to constructing functionality applicaitons does not simply inform you the right way to examine and expect functionality, it demonstrates the way to really in attaining functionality in a product. It combines a improvement procedure view with a low point dialogue on implementation info in a entire and well-structured reference which each and every SDL developer must have on their shelf.
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Additional resources for Systems engineering with SDL: developing performance-critical communications systems
Faster product development (time-to-market) Performance engineering activities require minimal extra overhead and time in the development phases. On the other hand, the redesign and subsequent reimplementation of a system or parts thereof obviously require much more time. 32 INTEGRATION OF PERFORMANCE ASPECTS IN THE DEVELOPMENT PROCESS Reduced risk of uncontrolled cost and delay Early evaluation and detection of potential problems allow control of the system development process to deal with risky parts or aspects of the system first.
Thus, the application of the performance evaluation in late development phases definitely allows for more accurate results. Our suggestion is to employ an evaluation for optimistic as well as for pessimistic assumptions on the performance of the system and to start with simple models. The use of an optimistic and a pessimistic evaluation is essential for early development phases where accurate input to the performance evaluation is hard to derive. If the pessimistic evaluation of the system indicates that the performance requirements are met, no further performance study is needed at this point.
In order to support quality assurance, the verification of the design against the requirements specification is an important issue. A central issue of the design activities is the selection of the most appropriate alternatives that meet the requirements and minimize development and system cost. A major problem is the complexity of this optimization problem. Typically, the optimum for a subproblem of the design process is not necessarily in accordance with the global goal of the system development activity.