Chapter 8 Quality attributes and sizing of the dXp • Performance: Performance covers various response-related metrics such as response time, system performance, system throughput, and such. • Modularity: The ability of the DXP to provide and support independent and reusable, plug-and-play type components • Extensibility: The ability of the DXP to support extensions to provide additional future capabilities • Security: The ability of the DXP to protect, manage, and secure sensitive information and data Other quality attributes relevant for a DXP are as follows: • Usability: Ease with which end user can use the DXP or learn the DXP-based application • Accessibility: The support provided by the DXP to access web applications for people with disabilities • Configurability: The ability of the DXP to allow configuration-driven changes • Stability: The degree to which the DXP can function normally during peak load • Interoperability: Ability of DXP to operate with other systems and services. • Efficiency: The ability of the DXP to perform functions with least resources (CPU, memory etc.) • Flexibility: The ability of the DXP to be reused across various scenarios with minimum modification. • Maintainability: The ease with which the DXP can be enhanced, maintained, fixed, and improved. In the coming sections, let us look at each of the quality attributes in detail. 216