Developing Enterprise Applications includes 2 requirements.

• Functional Requirements (FR)
• Non-Functional Requirements (NFR)

1. Functional Requirements (FR):

• FR's are the requirements which are taken care by the programmers.
• These are the functions that the system should perform.
• Example: Generation of reports is an FR.

1. Non-Functional Requirements (NFR):

• NFR's can't be handled by the programmers.
• These are the constraints that the system must work with in.
• Example: Reducing the response time of generation of reports.

Types of NFR's?

• Reliability
• Portability
• Performance
• Security
• Scalability
• Usability
• Availability
• Maintainability

How to address NFR's?

1. To address NFR's, application developers build their applications using Application Servers.

2. Application Servers provide all the system services to address NFR's such as:
   a. Data Integrity
   b. Resource Management
   c. Security

Need for identifying NFR's in EA?

1. EAs should be flexible enough to apply future changes - (Maintainability, Scalability)

2. EAs should be able to communicate to many users at a single point in time - (Availability, Concurrency)

3. Should ensure that the system is easily operated by the users - (Usability)

4. Data should be protected - (Security)

5. Reusability of the code when the application will be shifted from one environment to another - (Portability)

6. Based on the result of the EAs, decisions are taken - (Reliability)