On a systems development project, Richard needs two programmers. He knows John and Smith were able to create a program in 40 days similar to the one he wants to create on his project. He decides to use 40 days as his estimate. This is an example of what type of estimating?

Richard is using an estimate based on a project very similar to to his own with staff he will be using.  Answer A is incorrect because perametric modeling involves using a mathematical model to predict costs, such as dollars per line of code. Answer C is incorrect, although close; if the development project is a common item, such as putting down new flooring, a rule -of-thumb measurement can be used, although it is less accurate. Answer D is incorrect because it is not a form of estimating, but a type of pricing.