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Certified Enterprise Architect Professional (CEAP) - Module 10: Design for NFR's

The difference between functional and non functional requirements is depicted below:

functional  - > think scope, how system must work?

non functional -> think quality, how system should perform?

Functional requirements define what a product must do and what its features and functions are. Nonfunctional requirements describe the general properties of a system. They are also known as quality attributes.

NFRs describe system properties or attributes that are not directly tied to specific functions but instead govern how a system performs under certain conditions.

 NFR attributes:

  • performance
  • security
  • scalability
  • error handling
  • useability
  • maintainability
  • availability
  • portability
  • interoperability
  • efficiency
  • compliance
Key responsibilities of architects in managing NFRs:
  1. Define the system's non-functional requirements and documenting NFRs
  2. Analyzing the impact of NFRs
  3. Prioritizing NFRs
  4. Trade-off analysis
  5. Designing for NFRs
  6. Validation and verification
  7. Continuous improvement

How to manage NFRs in enterprise architecture:
  1. Identify and document NFRs
  2. Prioritize NFRs
  3. Integrate NFRs into design
  4. Monitor and measure NFRs

Example:
A non-functional requirement (NFR) in enterprise architecture could be something like "The system must be able to handle 10,000 concurrent users with a response time of under 2 seconds during peak hours," which specifies the performance and scalability needed for the system to function effectively under high load, rather than defining a specific feature or functionality. 

Examples of NFRs in enterprise architecture:
Performance:     Response time, throughput, peak load capacity 
Scalability:     Ability to handle increasing user load or data volume 
Security:     Access control, data encryption, vulnerability management 
Reliability:     System uptime, fault tolerance, disaster recovery 
Maintainability:     Ease of updating, debugging, and modifying the system 
Usability:     User interface intuitiveness, accessibility 
Availability:     System uptime percentage, planned maintenance windows

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