From Sterwiki

Cost estimation models are mathematical algorithms used to estimate the costs of a product or project. The results of the models are typically necessary to obtain approval to proceed, and are factored into business plans, budgets, and other financial planning and tracking mechanisms.

These algorithms were originally performed manually but now are almost universally computerized. They may be standardized (available in published texts or purchased commercially) or proprietary, depending on the type of business, product, or project in question. Simple models may use standard spreadsheet products.

Models typically function throught the input of parameters that describe the attributes of the product or project in question, and possibly physical resource requirements. The model then provides as output various resources requirements in cost and time.

Typical applications include:

• Construction
  
• Software Development
  
• Manufacturing
  
• Product Development