Question 1

What is a software requirements specification?

Accepted Answer

A software requirements specification (SRS) is a document that describes what a software system must do and how it must perform. It includes functional requirements that define the features and behaviors of the system, non-functional requirements that specify quality attributes like performance and security, constraints that limit design choices, and assumptions about the environment. The SRS serves as a contract between stakeholders and the development team, ensuring everyone agrees on what will be built before coding starts. A good SRS is clear, complete, consistent, verifiable, and traceable. It follows standards like IEEE 830 or more lightweight modern formats. The document helps prevent scope creep, reduces miscommunication, enables accurate estimates, and provides a reference for testing. For agile teams, requirements may be captured as user stories instead of a formal SRS, but the same principles apply.

Question 2

What is the difference between functional and non-functional requirements?

Accepted Answer

Functional requirements describe what the system must do — specific behaviors, features, and outputs. Examples include "users can create an account with email and password," "the app sends a push notification when a new message arrives," or "orders must be processed within 5 seconds of payment confirmation." Non-functional requirements describe how the system must perform its functions — the quality attributes and constraints. Examples include performance (API responses under 500ms), security (data encrypted at rest and in transit), scalability (supports 10,000 concurrent users), usability (meets WCAG accessibility standards), and reliability (99.9% uptime). Both types are essential. Missing functional requirements means missing features. Missing non-functional requirements leads to a product that works but fails under real-world conditions. Good requirements documents balance both, with clear traceability from business goals to specific requirements to test cases.

Question 3

How detailed should requirements be?

Accepted Answer

Requirements should be detailed enough that a developer could build the feature without needing to ask clarifying questions, but not so detailed that they prescribe implementation. The sweet spot is the "what" and "why" without the "how." For example, "The system shall allow users to reset their password via a secure email link that expires in 24 hours" is appropriately detailed. It specifies the behavior and constraints without dictating which library to use. Avoid vague requirements like "the app should be fast" — instead specify "API responses must complete within 500ms at the 95th percentile under normal load." The level of detail should match the project phase and team experience. Early-stage startups with tight deadlines benefit from lightweight requirements and user stories. Enterprise projects with distributed teams and compliance needs require more formal, detailed documentation. Err on the side of clarity over completeness.

Question 4

What are common requirements mistakes to avoid?

Accepted Answer

The most common mistakes include being too vague ("the system should be user-friendly"), mixing requirements with design decisions ("use React Native" is a constraint, not a requirement), missing non-functional requirements entirely, and failing to prioritize. Another common mistake is writing requirements in isolation without stakeholder input, leading to a document that does not reflect actual user needs. Teams also often skip the "out of scope" section, which leads to scope creep. Avoid requirements that cannot be tested — if you cannot write a test case to verify it, the requirement is too vague. Do not over-specify by including implementation details that lock the team into specific solutions. Finally, avoid treating requirements as fixed. They should evolve as you learn from users and discover constraints. Use change control for significant changes but expect refinement throughout the project.

Question 5

What is MoSCoW prioritization for requirements?

Accepted Answer

MoSCoW is a prioritization technique that categorizes requirements into four groups: Must Have (critical for launch, no workaround exists), Should Have (important but not critical, workarounds exist), Could Have (desirable but easily dropped), and Won't Have (explicitly out of scope for this release). The typical distribution is 50 to 60 percent Must Have, 20 to 30 percent Should Have, 10 to 20 percent Could Have, with Won't Have documented separately. This technique forces tough conversations early about what truly matters. A common mistake is labeling everything as Must Have, which defeats the purpose. If you cannot ship without a feature and users will abandon the product without it, it is Must Have. If you can ship a working MVP without it and users would still find value, it is Should Have. MoSCoW helps teams deliver an MVP on time by providing clear guidance on what to cut when deadlines approach.

Question 6

Can AI generate requirements for my app?

Accepted Answer

Yes, AI can generate comprehensive requirements specifications from a natural language app description. AI requirements generators analyze your concept and produce structured documents covering functional modules, non-functional requirements, constraints, dependencies, and out-of-scope items. They are particularly effective at identifying common requirements that teams often forget, such as password reset flows, data export capabilities, admin interfaces, and accessibility standards. The AI considers typical patterns for similar apps and applies industry best practices to NFR categories like security and performance. Generated requirements serve as an excellent starting point that you can refine based on stakeholder interviews and business constraints. Using AI can compress weeks of requirements gathering into minutes, allowing teams to move to prototyping and validation faster. Tools like RapidNative can then take the next step by generating the actual application code from those requirements.

Type	What It Defines	Example
Functional	What the system must do	Users can reset password via email link
Performance	Speed and responsiveness	API responses under 500ms at p95
Security	Data protection and access control	All data encrypted at rest and in transit
Scalability	How the system grows	Supports 10,000 concurrent users
Usability	Ease of use	First-time users complete signup in under 60s
Reliability	Availability and fault tolerance	99.9% uptime, graceful error handling
Accessibility	Inclusive design	WCAG 2.1 AA compliant

Type	What It Defines	Example
Functional	What the system must do	Users can reset password via email link
Performance	Speed and responsiveness	API responses under 500ms at p95
Security	Data protection and access control	All data encrypted at rest and in transit
Scalability	How the system grows	Supports 10,000 concurrent users
Usability	Ease of use	First-time users complete signup in under 60s
Reliability	Availability and fault tolerance	99.9% uptime, graceful error handling
Accessibility	Inclusive design	WCAG 2.1 AA compliant

Free App Requirements Generator

How to Write Software Requirements

Types of Requirements

Prioritizing with MoSCoW

Frequently Asked Questions

How to Write Software Requirements

Types of Requirements

Prioritizing with MoSCoW

Frequently Asked Questions