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Analysis of the gap between initial estimated size and final (True) size of implemented software

Abstract:

In this paper, we investigate the gap between the final true functional size of a piece of software at project closure and the functional size estimated much earlier in the development life cycle when the initial set of requirements is incomplete and often ambiguous. The different components and dimensions of this gap are identified and an approach is proposed to address them. The purpose of this approach is to improve early functional size estimation and, in turn, improve effort estimation. For the purposes of this paper, the ISO 19761 COSMIC standard on functional size measurement is taken as reference for discussion, while the majority of concepts presented are generic to most other similar ISO standards.