A Consideration on External Requirements Completeness

Abstract

Internal completeness of functional requirements is defined by functional exceptions so that defects do not occur within the system.Digitalization, the reconstruction of business processes using digital technology, requires requirement specifications that are consistent with business processes. Such requirement specifications require completeness of requirements from the perspective of the system's operation process, rather than internal completeness of the system's functional requirements.This paper proposes external completeness of such requirements. It also explains a "defect prevention diagram" that can analyze the external completeness of requirements, including business processes. A defect prevention diagram can prevent the occurrence of ad-hoc business processes and prevent business defects based on acceptance conditions, resource conditions, decision conditions, and exception conditions.