The proper working of online banking is essential for development and advancement over the world and influencing organizations, society and individuals. Online banking, a vital activity within the financial markets is experiencing real change fuelled by advances in information systems techniques. Non - functional requirements (NFRs) are important software requirements that have been evaluated and specified right from the beginning of software development cycle while specifying the functional software requirements (FRs). Nfrs could be thought of as additional requirements that must be fulfilled by the functional requirements. The dissatisfaction of Nfrs is one of the indispensable purposes behind the failure of software projects. Non- functional requirements for instance accuracy, usability, performance and security are often crucial to online banking system. Accordingly the nonfunctional requirements or Nfrs should be given attention as early as possible in a software lifecycle and must be shown in the software design before conferring to the detailed design. The inspiration driving this paper is to examine how the assessment of Nfrs of online banking system serves to systematically make choice among different alternatives.