Requirements are often divided into functional requirements (FRs) and quality requirements (QRs). However, we still have little knowledge about to which extent this distinction makes sense from a practical perspective. In this paper, we report on a survey we conducted with 103 practitioners to explore whether and, if so, why they handle requirements labeled as FRs differently from those labeled...

This paper deals with the organization of concepts and ideas as regards the relation between quality and web accessible services. We discuss the concept of service and service requestor. We investigate their mutual expectations and offered functionalities that involve both functional and non-functional requirements. The relation between nonfunctional requirements and quality attributes is prese...

This paper presents a proposal to validate non functional requirements based on the NFR-framework. Our aim is to offer a systematization to validate nonfunctional requirements, analyzing its evolution and the quality of the original document specification regarding the non-functional requirements. In order to achieve that we tested the systematization in 3 (three) documents of requirement speci...

Conflicts identification among non-functional requirements is often identified intuitively which impairs conflict analysis practices. This paper proposes a new model to identify conflicts among non-functional requirements. The proposed model uses the matrix mechanism to identify the quality based conflicts among non-functional requirements. The potential conflicts are identified through the map...

quality of service (qos) is an important issue in the design and management of web service composition. qos in web services consists of various non-functional factors, such as execution cost, execution time, availability, successful execution rate, and security. in recent years, the number of available web services has proliferated, and then offered the same services increasingly. the same web ...

This paper proposes an eco-design method to systematically generate design concepts for the reduction of environmental impacts. The method is based on the integration of quality function deployment (QFD) and functional analysis (FA) at the early design stage. While QFD provides a framework to reflect the “voice of environment” in the design planning and evaluations, FA focuses on the functional...

Software Requirements Specification (SRS) is the key documentation, defining the functional and non-functional system requirements. By revisiting a number of in the literature much discussed key aspects related to SRS and extracting essential views from the author’s daily work experience, this papers stresses the importance of the SRS and examines the process, which enables the emergence of a q...

Definitions of the concepts derived from the goal concept (including functional and nonfunctional goal, hardgoal, and softgoal) used in requirements engineering are discussed, and precise (and, when appropriate, mathematical) definitions are suggested. The concept of satisficing, associated to softgoals is revisited. A softgoal is satisficed when thresholds of some precise criteria are reached....

This paper presents the idea of Usage Oriented Requirements Engineering, an extension of Use Case Driven Analysis. The main objective is to achieve a requirements engineering process resulting in a model which captures both functional requirements and system usage aspects in a comprehensive manner. The paper presents the basic concepts and the process of Usage Oriented Requirements Engineering,...