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The objective of developing a budget in the project cost template is to capture resource needs, risks and assumptions and provide a high level cost range for a project over multiple fiscal years. In addition, it helps a project manager identify all resources that are needed on the project both by resource type (QA Analyst, Developer, etc.). It also allows a project manager to document assumptions and estimates for ongoing support and maintenance.
For more detailed information, you can download the IS&T Finance presentation here: Project Budget Process_021111.pptx
Or visit the IS&T Finance wiki: IS&T Finance Project Start Up Guidelines