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They are a unit measure for software like an hour is used to measure time, miles are used to measure distance or Celsius is for measuring temperature. Function Points are an ordinal measure like other measures for example hours, Fahrenheit, kilometers, etc.
This approach calculate the total function points value for the project, by adding up the number of external user inquiries, outputs, inputs and master files, and then apply the following weights: inputs, outputs, inquiries, and master files. Each FP contributor can be adjusted within a range of ±35% for a specific project complexity.