If you are trying to document non-functional requirements for a software project right now, the first thing you need is a consistent structure. A well-designed non-functional requirements template forces the right conversations early, before architects make assumptions, before developers start coding, and before sponsors sign off on something nobody has actually tested. I have used variations of this template across government, health, utilities, and enterprise environments for more than two decades, and the single biggest mistake I see is treating NFRs as something you fill in after the functional requirements are done. They are not. They shape every technical decision on the project.
This article gives you a working template, explains what goes in each field, and walks you through a real example of how that template played out on a project where stakeholders pushed back hard. If you want context on how NFRs sit alongside functional and business requirements more broadly, the article on business vs functional vs non-functional requirements is worth reading alongside this one.
The Core NFR Template Structure
Every NFR record I write contains the same seven fields. Some project teams use a spreadsheet, some use a requirements management tool, and some embed them in a larger specification document. The format matters less than the discipline of populating every field for every requirement. Here is the structure:
| Field | Purpose | Example Entry |
|---|---|---|
| NFR Category | Groups the requirement by quality attribute | Performance |
| Requirement | States what the system must do or be | The search function must return results within an acceptable time under normal load |
| Metric | Defines how the requirement will be measured | Response time in seconds under concurrent user load |
| Target Value | Sets the threshold that constitutes passing | Under 2 seconds for 500 concurrent users |
| Priority | Signals which NFRs are non-negotiable vs aspirational | High |
| Verification Method | Describes how the requirement will be tested | Load testing using a defined test script |
| Notes | Captures assumptions, constraints, or decisions made | Peak load assumes end-of-month payroll processing window |
The original version of this template I used in early career had no Verification Method field. That omission caused serious problems during UAT on more than one project, because QA teams had no agreed basis for testing NFRs and either skipped them entirely or invented their own thresholds. Adding that field changed everything.
NFR Categories to Cover in Your Template
Not every project needs every category, but you should consciously decide which ones apply rather than leaving gaps by accident. Here are the categories I include as standard, with a brief explanation of what each one captures:
- Performance: Response times, throughput, and latency under defined load conditions. This is the category most stakeholders care about, and also the one most often defined vaguely.
- Scalability: The system’s ability to handle increased user numbers or data volumes without degradation. Relevant to any system expected to grow.
- Reliability: The probability that the system operates without failure over a given period. Expressed as a percentage or mean time between failures.
- Availability: The proportion of time the system is accessible and operational. Typically expressed as uptime percentage, such as 99.9% excluding planned maintenance.
- Security: Resilience against unauthorised access, data breaches, and integrity failures. In regulated environments this category alone can generate dozens of requirements.
- Maintainability: The effort required to locate, diagnose, and fix defects or make changes. Captures things like logging standards, modular architecture requirements, and documentation obligations.
- Usability: The quality of the user experience relative to defined tasks. Where possible, tie this to measurable outcomes such as task completion rate or number of steps to complete a defined workflow.
For a deeper look at how these categories play out in specific contexts, the non-functional requirements examples and templates article provides a detailed breakdown with worked examples across multiple domains.
How to Populate the Template: What Good Looks Like vs What Gets Rejected
The biggest failure mode with NFR templates is vagueness. The table below shows the difference between an NFR that will survive a review and one that will get pushed back by an architect or test manager.
| NFR Category | Weak Version (Fails Review) | Strong Version (Passes Review) |
|---|---|---|
| Performance | The system must be fast | The system must return search results in under 2 seconds for up to 500 concurrent users during peak load |
| Availability | The system must be available most of the time | The system must achieve 99.9% uptime during business hours (07:00 to 19:00), excluding planned maintenance windows |
| Security | The system must be secure | All data in transit must be encrypted using TLS 1.2 or above; all data at rest must be encrypted using AES-256 |
| Usability | The system must be easy to use | A trained user must be able to complete a standard referral within 4 minutes with no more than 6 screen interactions |
| Scalability | The system must handle growth | The system must support a 300% increase in registered users over 24 months without architectural changes |
A Real Example: Where the Template Saved the Project and Where It Created a Fight
On Project X, a case management system replacement for a mid-sized public sector organisation, I was brought in partway through the discovery phase. The project had a BRD in draft, a set of user stories underway, and absolutely no documented NFRs beyond a single bullet point in the project brief that said “the system must perform adequately under normal operating conditions.” Nobody had defined what adequate meant, and nobody had defined normal.
I ran a half-day NFR workshop with the solution architect, the operations manager, the IT security lead, and two senior users. We worked through each category systematically. For performance, the operations manager told me that the critical window was Monday mornings between 8am and 10am, when case workers logged in and ran their daily allocation reports. We defined a load scenario: 220 concurrent users, all running the allocation report within the same 90-minute window. The architect went pale. The system the vendor had proposed was not sized for that.
That discovery prompted a formal change to the solution specification and a revised commercial negotiation with the vendor. The vendor pushed back, arguing that the NFRs were being introduced too late in the process and that meeting the performance threshold would require an additional infrastructure tier costing around $40,000. The project sponsor initially sided with the vendor, suggesting we relax the requirement. I held the position that the Monday morning load was not an edge case, it was the normal operating pattern, and I had the data from the operations manager to prove it. After two rounds of escalation, the additional infrastructure was approved and the NFR stood.
The usability requirement caused a different problem. I had specified that a trained user must complete a standard case referral in under 4 minutes. During UAT, the vendor demonstrated a workflow that took 7 minutes. They argued that the 4-minute target was based on the old system and the new system had a more thorough process. That argument might have worked if the NFR had not been formally signed off by the project sponsor. Because it was in the template and signed off, it formed part of the acceptance criteria, and the vendor had to redesign two screens before sign-off was granted.
If you are also trying to determine which of your NFRs matter most before running a workshop like this, the non-functional requirements checklist gives you a comprehensive starting point for identifying gaps.
Best Practices When Using the Template on a Live Project
- Involve operations staff, not just sponsors: Sponsors set strategy but operations staff know the actual load patterns, the failure modes, and the times when system unavailability causes real harm. Both voices belong in the NFR workshop.
- Set target values before architecture is confirmed: Once the technical approach is locked, there is commercial pressure to reverse-engineer NFRs to match what has already been built. Setting values early removes that pressure.
- Separate NFRs from functional requirements in your documentation: Mixing them creates confusion during testing. I maintain a dedicated NFR register alongside the functional requirements document, cross-referenced by category and priority.
- Assign a priority to every record: High priority NFRs are non-negotiable acceptance criteria. Medium priority NFRs are targets. Low priority NFRs are aspirational. Making that distinction explicit prevents every NFR from being treated as a blocker.
- Revisit NFRs at architecture and design gates: New information about the technical environment, integration dependencies, or data volumes often changes what is feasible. Build a review step into your project gates rather than treating the NFR register as a set-and-forget document.
- Link each NFR to its verification method: If you cannot describe how the requirement will be tested, it is not yet a requirement. It is a wish. The test description does not need to be a full test script at this stage, but it must be specific enough that a test manager can design from it.
What to Do When NFRs Conflict
NFR conflicts are more common than most project teams expect. High security requirements increase complexity and can reduce performance. High availability requirements drive up infrastructure costs that then conflict with budget constraints. Aggressive scalability targets can conflict with maintainability if they push the solution toward a more complex architecture than the team can support.
When conflicts surface, the template itself becomes the tool for resolution. Because each NFR has a priority field, you have a documented basis for the trade-off conversation. In my experience, the conflict resolution conversation goes much faster when every stakeholder can see the two competing requirements side by side with their priorities, their target values, and their verification methods clearly stated. It moves the conversation from opinion to decision.
The discipline of capturing NFRs properly is not about paperwork. It is about giving every stakeholder, every architect, every developer, and every test manager a shared, agreed picture of what done actually looks like. When that picture exists from the start of the project, the arguments that happen late in delivery, the ones that cost real money and real time, either never arise or resolve faster because the evidence is already in writing.
Frequently asked questions
What is a non-functional requirements template?
A non-functional requirements template is a structured document used to capture how a system must perform, rather than what it must do. It typically includes fields for the NFR category, the specific requirement, a measurable metric, a target value, a priority rating, and a verification method. Using a consistent template ensures NFRs are testable and agreed before development begins.
What should be included in a non-functional requirements template?
At a minimum, the template should include the NFR category, a clear statement of the requirement, a quantitative metric, a target value or threshold, a priority level, and a description of how the requirement will be tested. Adding a notes field for assumptions and a verification method field prevents ambiguity during UAT and acceptance testing.
What are examples of non-functional requirements?
Common examples include performance requirements such as returning search results in under 2 seconds for 500 concurrent users, availability requirements such as 99.9% uptime during business hours, security requirements such as AES-256 encryption for data at rest, and usability requirements such as completing a standard task within a defined number of steps. Each example should have a measurable target, not just a general description.
How do you write measurable non-functional requirements?
Start by identifying the quality attribute you want to capture, then define a metric that can be objectively tested, and finally set a target value based on real operational data. For example, instead of writing that the system must be fast, write that the system must respond to search queries in under 2 seconds for up to 500 concurrent users during the defined peak window. Involving operations staff in setting target values is the most reliable way to ground NFRs in reality.
When should non-functional requirements be defined in a project?
NFRs should be defined during the requirements discovery phase, before the solution architecture is confirmed. Defining them after architecture decisions are made creates commercial and technical pressure to reverse-engineer targets to match what has already been designed. Early definition also means NFRs can be formally signed off alongside functional requirements and included in vendor contracts and acceptance criteria.
Try Ash, Your Virtual BA
If you have worked through the template structure in this article and you are now ready to draft your actual NFR register, Ash can help you do that faster and with more consistency. Ash is trained on BA practice and can guide you through each NFR category, prompt you for target values, and help you write requirements that will hold up in a vendor review or UAT sign-off. It is the practical next step once the template structure makes sense and you need to produce the real document. Try Ash Virtual BA.
Further reading
- Beyond Functionality: The Critical Role of Non-Functional Requirements | Exclusive Articles for IIBA Members
- 10.30 Non-Functional Requirements Analysis | BABOK® Guide
Written by Sam Cordes, founder of the Business Analyst’s Toolkit.