NDLI: A software design and evaluation system

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A software design and evaluation system

Content Provider	ACM Digital Library
Author	Graham, Robert M. Clancy, Gerald J. DeVaney, David B.
Abstract	One of the most difficult problems facing the software designer and implementer is that of evaluating the performance of a proposed design before it is actually implemented. Pre-implementation evaluation is invaluable in assisting the designer to meet the specified performance objectives of the system being designed. This problem of meeting objectives is particularly severe for large multi-programmed, multi-processing operating systems. These systems have become so complex that even the most experienced system designer is unable to evaluate a system's performance using intuition alone. Use of more formal methods is required. Existing techniques are handicapped by a severe time lag. To avoid costly re-implementation, feedback must get to the designers before the design is “cast in concrete.” In this paper we describe a system which provides performance information at all stages in the design and implementation of a software system (which we will call the object system). Using this feedback the designer can spot the problems which adversely affect performance early enough in the design-implementation sequence that they can be corrected without having to reimplement much of the object system. The key idea in our design and evaluation system is to use a single language to describe the object system at all stages of its design and implementation. This evolving source language description of the object system is used as direct input to the evaluation procedures. The initial sketch of the system's structure and data bases, which is the gross design specification, evolves into a final, detailed implementation specification which can be compiled into executable object code. As soon as any part of the object system is specified some evaluation information is available. As the design becomes more detailed this information becomes more precise. Thus, a fairly detailed and precise picture of the object system's performance is developed before it is implemented.
Starting Page	200
Ending Page	213
Page Count	14
DOI	10.1145/800024.808359
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1971-01-01
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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