Any historical relationships that result in parametric estimates or analogous estimates involve the use of project characteristics (parameters) to develop mathematical models to predict total project costs. Such models can be simple (e.g., residential home construction is based on a certain cost per amount per square foot of space) or complex (e.g., one model of software development costing uses multiple separate adjustment factors, each of which has numerous points within it).
Both the cost and accuracy of analogous and parametric models can vary widely. They are most likely to be reliable when:
• Historical information used to develop the model is accurate,
• Parameters used in the model are readily quantifiable, and
• Models are scalable, such that they work for a large project, a small project, and phases of a project.
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What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.