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of programmers, can take years to finish Any software project that involves people numbering in the tens, and time frames of a year or more, really need a well-defined development process Today, the Rational Unified Process, or RUP, developed by The Three Amigos, is the main heavyweight methodology in widespread use While the main principles of RUP may be used by themselves as a development process, they are almost exclusively associated with Rational Software which has a large number of software development tools to help with RUP-based development Let there be no doubt about just what RUP is It is a very good development process, most suitable for large software projects It has many strong points to its procedures and philosophies It is somewhat adaptable to different project needs However, it is large and comprehensive This means it requires extensive training to use properly It is also expensive Rational Software is the principle supplier of the software tools used for RUP It can cost several thousand dollars for each developer seat The whole process is heavily documentation oriented, and requires significant management resources This is not to imply that there is anything wrong with RUP It was developed by some of the best software methodologists around It has been shown to work for a wide variety of software projects What is not clear, though, is if such a heavyweight process is best, or even needed, for smaller projects Overview of the Unified Process In many ways, RUP is not all that different from the basic software development process we discussed in 4 It starts with significant planning, includes analysis and design, and finishes with building and releasing One of the strengths of RUP is that it makes all
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these steps part of an overall process that includes support for both the management and the software engineering sides of the processThe whole process is iterative, with a goal of producing some tangible result at the end of each iteration Basic Concepts One way to look at RUP is to view it as a two-dimensional process as shown in Figure 9-1 Overall, a software development cycle is made up of four phases: Inception, Elaboration, Construction, and Transition There are activities, or workflows, that are parts of each cycle, including Business Modeling, Requirements, Analysis and Design, Implementation, Test, and others Management View
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Inception Iterations
Elaboration Iterations
Construction Iterations
Transition Iterations
Iterations
Engineering View Figure 9-1 Overview of RUP
The entire process is iterative Each phase will itself consist of one or more the four phase cycles Thus, the main construction phase may consist of several cycles, each producing a more complete product than the last One of the goals of RUP is to produce some kind of product at the end of each cycle The vertical lines between each phase in Figure 9-1 are milestones
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Progress on the project is tracked using these milestones The horizontal lines associated with each workflow help indicate when the activity is carried out during the development cycle While Figure 91 shows the time line of each work flow, there is also an intensity associated with each workflow not shown by the *'s in this diagram For example, the Analysis & Design workflow will involve the most effort at the beginning of the development cycle in inception and elaboration, while the implementation workflow will be most intense in the construction phase This view of development also can be used to help control the project from both a high level management viewpoint, and a lower lever engineering viewpoint Top level management can view the whole project as one big cycle of the four phases, while the engineering view will see the iterative cycles that really make the project work Different levels of management can use different milestones to track project progress One of the features of RUP is that it is designed to be flexible The RUP support tools available from Rational Software can be used to modify the process to fit a particular project The number of iterations involved, the timing of milestones, the total number of people involved can be handled flexibly And because the process is inherently iterative, there is some flexibility built in to handle changing requirements One of the problems with any activity involving tens or hundreds of people is that the whole process can get too rigid and impersonal With many people involved, there will often be a management bureaucracy and an emphasis on producing documentation to track project progress This may be inevitable when dealing with that many people However, it can also be quite impersonal, and frustrating for programmers who like to think of their work as having a high level of creativity