AThe '''function point''' is a "unit of measurement" to express the amount of business functionality an [[information system]] (as a product) provides to a user. Function points are used to compute a functional size measurement (FSM) of software. The cost (in dollars or hours) of a single unit is calculated from past projects.<ref>Thomas Cutting, [http://www.pmhut.com/estimating-lessons-learned-in-project-management-traditional Estimating Lessons Learned in Project Management – Traditional], Retrieved on May 28, 2010</ref>