PSP(sm): A Self-Improvement Process for Software Engineers Review

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PSP(sm): A Self-Improvement Process for Software Engineers ReviewThe intent is to reduce the defect rate in software. With an emphasis on doing this when we have several million lines of source code. All the more so if the application might involve safety issues or be critical to its company's bottom line.
Humphrey points out that the writing of such large code might typically follow practices used for code bodies orders of magnitude smaller. But that this leads to far too many defects. He explains that PSP offers a discipline for the individual programmer to follow. And how this can be scaled to a team of programmers.
PSP stresses investing in design time and review time, relative to the actual coding time. It's big on writing down the times spent on these stages, so that you have actual quantities to see and from which to get metrics. You cannot improve what you cannot measure. The review time is considered a good investment, for finding bugs here is inherently more productive than relying on a downstream testing stage or user feedback.
Perhaps the most contentious aspect is whether to do a review of your code before compiling it?! Many will not. After all, the compiler can swiftly find the syntax errors. Why waste time looking for these beforehand? Isn't this a retrograde step? The book's rejoinder is that syntax errors might be considered to be distributed like more serious logic errors. Hence, if you review before compiling, and find 80% of the syntax errors that the compiler finds, then perhaps you only also found 80% of the logic errors. Opps?
A simple and ingenious self diagnostic tool. But despite the logic of this, water will flow uphill before any significant portion of programmers adopts this method. Pressing 'make' or its equivalent to do a compilation is simply too easy. The book is on far more plausible ground describing the other aspects of PSP.PSP(sm): A Self-Improvement Process for Software Engineers Overview
Most software-development groups have embarrassing records: By some accounts, more than half of all software projects are significantly late and over budget, and nearly a quarter of them are cancelled without ever being completed. Although developers recognize that unrealistic schedules, inadequate resources, and unstable requirements are often to blame for such failures, few know how to solve these problems. Fortunately, the Personal Software Process (PSP) provides a clear and proven solution. Comprising precise methods developed over many years by Watts S. Humphrey and the Software Engineering Institute (SEI), the PSP has successfully transformed work practices in a wide range of organizations and has already produced some striking results.

This book describes the PSP and is the definitive guide and reference for its latest iteration. PSP training focuses on the skills required by individual software engineers to improve their personal performance. Once learned and effectively applied, PSP-trained engineers are qualified to participate on a team using the Team Software Process (TSP), the methods for which are described in the final chapter of the book. The goal for both PSP and TSP is to give developers exactly what they need to deliver quality products on predictable schedules.

PSPSM: A Self-Improvement Process for Software Engineers presents a disciplined process for software engineers and anyone else involved in software development. This process includes defect management, comprehensive planning, and precise project tracking and reporting.

The book first scales down industrial software practices to fit the needs of the module-sized program development, then walks readers through a progressive sequence of practices that provide a sound foundation for large-scale software development. By doing the exercises in the book, and using the PSP methods described here to plan, evaluate, manage, and control the quality of your own work, you will be well prepared to apply those methods on ever larger and more critical projects.

Drawing on the author's extensive experience helping organizations to achieve their development goals, and with the PSP benefits well illustrated, the book presents the process in carefully crafted steps. The first chapter describes overall principles and strategies. The next two explain how to follow a defined process, as well as how to gather and use the data required to manage a programming job. Several chapters then cover estimating and planning, followed by quality management and design. The last two chapters show how to put the PSP to work, and how to use it on a team project. A variety of support materials for the book, as described in the Preface, are available on the Web.

If you or your organization are looking for a way to improve your project success rate, the PSP could well be your answer.


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