A plethora of software estimation tools are available, each claimed to be better than the others, thereby confusing prospective buyers. An effective tool ought to provide for all four aspects of software estimation, namely, size, effort, cost, and schedule.
size of these. Therefore, criterion number one for selecting a software estimation tool is the tool must allow multiple units of measure for software size In other words, the tool must allow the user to carry out software estimation using multiple, commonly used software size measures. Common Unit of Measure for Software Size Now the question becomes—if the size measurement is carried out using different software size measures, how does the organization measure its productivity and capacity?