The Project Cumulative Cost will change over the life of your project, almost always increasing. It is important to realize how the cost of certain items will vary with Quantity of Work Done or with Time passed.

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Fixed Costs: Costs that are Fixed, do not change over the life of the project. Examples include        

                       building permits, mobilization to site, and IT set-ups. These are "one-time" costs, and

                       are permanent for the life of the project.

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Semi-fixed Costs: For part of the Work Done, or part of the Time, the cost is fixed. Then, the cost

                                changes; either to a new fixed cost (shown) or to a variable cost. For     

                                example: sometimes after a project gets started, additional insurance or bonding is

                                required to be paid.

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Variable Costs: These costs vary with the Work Done or the Time passed. Common examples are

                            material purchases, labour wages, and rentals.