Four Layered Approach to Non-Functional Requirements Analysis

TL;DR

This paper introduces a four-layered analysis approach for identifying non-functional requirements in software development, aiming to improve completeness and stakeholder satisfaction, validated through case studies and metrics.

Contribution

The paper proposes a novel four-layered approach with specific rules for non-functional requirements analysis, enhancing over existing non-layered methods.

Findings

Successfully applied on two case studies

Validated requirements with checklists and metrics

Improved completeness of requirement identification

Abstract

Identification of non-functional requirements is important for successful development and deployment of the software product. The acceptance of the software product by the customer depends on the non-functional requirements which are incorporated in the software. For this, we need to identify all the non-functional requirements required by all stakeholders. In the literature not many approaches are available for this purpose. Hence, we have proposed a four layered analysis approach for identification of non-functional requirements. The proposed layered approach has many advantages over non-layered approach. As part of this approach some rules are also proposed to be used in each layer. The approach is applied successfully on two case studies. The identified non-functional requirements are validated using a check list and in addition the completeness of the identified non-requirements is computed using a metric.