Change requests represent a typical unknown or uncertain project cost because the project team cannot know in advance exactly which changes stakeholders may request, whether those changes will be approved, or how much additional effort they will require.
A project budget should therefore include contingency for uncertainties that may affect scope, schedule, resources, or deliverables. An approved change may require additional design work, development time, technology, subject matter expertise, testing, communications, or implementation support. Without contingency, even reasonable changes can create budget overruns.
Equipment, travel, and materials are generally more predictable because they can usually be estimated during project planning using quantities, rates, schedules, quotations, or historical costs. Their final amounts may vary, but they are normally identifiable budget categories.
Effective project budgeting distinguishes known costs from uncertainty and includes appropriate reserves based on project risk. Change management is also essential: requests should be evaluated for their impact before being approved rather than informally absorbed into project work. This helps protect budget integrity and prevents uncontrolled expansion of the project.
Study Guide Topics: Project Management; project budgeting; contingency costs; change requests; cost management.
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