What problem you’re solving for ???

Functional vs Non-Functional

Functional requirements specify a specific capability/service that the system should provide. It's what the system does.

Non-functional requirements place a constraint on how the system can achieve that. Typically this is a performance characteristic.

<aside> ⛔ Examples:

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Functional:

1. The system must send a notification to all users whenever there is a new post, or someone comments on an existing post.
2. The program needs to find all viable organ donors in the database.

Non-functional:

1. The system must send emails no later than 30 minutes after from such an activity.
2. The university website needs to be available 24 hours a day.

Requirements Engineering

1. RE is ???

• A set of activities focused on identifying the purpose and goal of a software system

• A negotiation process where stakeholders agree on what they want.

  Stakeholders include:

  1. End user(s)
  2. Client(s) (often businesses)
  3. Design team(s)

2. Logical process

Elicitation

Analysis

Specification

Validation

3. Challenges during RE ???

Examples: