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<h2 class="first-section-title"><a name="288"></a><a name="ch09lev1sec2"></a>Critical Path</h2><p class="first-para">The <b class="bold">critical path</b> comprises the dependent tasks that take the longest. In effect, the critical path determines the length of the project. A delay of one day to the critical path will delay the project by one day. Conversely, one day saved in the critical path will allow the project to come in one day early. If you're a technical architect doubling as a project manager, pay more attention to the critical path than to anything else. Most project management software packages highlight the critical path if you have entered all the resource assignments and dependencies completely.</p>
<p class="para">A critical path can shift. If you save enough time on a critical path task, it's possible that it isn't on the critical path anymore—something else is. If a long delay occurs for a task that is not on the critical path but is still essential, the task might become part of the critical path.</p>
<p class="para">For example, financial analysis software I helped develop included a component responsible for generating analysis using company financial information and financial models that users input. In the beginning, this component was not part of the critical path. But as the project proceeded, the critical path changed to incorporate the component because the developer leading the effort to write it didn't have enough knowledge and experience for the task.</p>
<p class="last-para">The best books I've encountered on the importance of the critical path (and planning in general) are Goldratt (<a href="LiB0065.html#294" target="_parent" class="chapterjump">1992</a>, 1997). Although both books use factory assembly lines as examples, the concepts are applicable to J2EE projects (and with their novel-like formats, the books are entertaining reads).</p>
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