Non-functional requirements: Scalability

Author: Adam Alami, PhD Fellow, IT University of Copenhagen (translated from English.)
 
 

INTRODUCTION


 
Nonfunctional requirements are widely represented in the literature. There is no shortage of definitions and examples of non-functional requirements. The International Institute for Business Analysis (IIBA) defines non-functional requirements as follows:
 
 
Non-functional requirements fix conditions that are not directly related to the behavior or functionality of the solution, but rather describe the environmental conditions under which the solution must remain effective, or the qualities that the system must possess. They are also known as quality attributes (indicators) or additional requirements. They can include requirements related to bandwidth, speed, security, availability, information architecture and user interface presentation.
 
 
The key words in this definition are "not directly related to the behavior or functionality of the solution." This is either "conditions" or "qualities."
 
 
Conditions : they are external or internal constraints. Internal constraints are the policy and self-regulation of the organization, while external constraints are state regulations, industry standards and other parameters that determine the business environment.
 
 
Qualities : these are business requirements that define not systemic behavior and are not related to the process, but are requirements to the quality of the solution.
 
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