7 Common Mistakes in Software Requirements Specification

The seven most common mistakes in a software requirements specification (SRS) are unclear objectives, leaving out key stakeholders, overlooking non-functional requirements, ambiguous language, failing to prioritize features, neglecting to update the SRS, and insufficient detail. Getting the SRS right is not optional: nearly 60% of software projects can land in serious trouble when requirements are not properly defined. This guide walks through each mistake with the real cost examples and practical tips to fix it.

What is a software requirements specification, and why does it matter?

A software requirements specification (SRS) is an exhaustive project plan that captures a product’s functions, capabilities, and constraints. It gives everyone involved, stakeholders and developers alike, a shared understanding of the target objectives so they can work together to build a product that satisfies everyone. Skimp on it and you rarely save a penny.

Underestimating the complexity of technical project management sits at the top of the list of common mistakes. It can drag the process out, cause budget overruns, or produce software that does not cater to user requests. Bad SRS practices like unintentional duplication, omissions, and unspecified requirements lead to miscommunication, neglected details, and ambiguous requirements that can ultimately ruin a project.

Here are the seven failures people most often make while creating software requirements.

Mistake 1: Lack of clear objectives

“Clear objectives are the compass that guides the entire development process,” says Ihor Prudyvus, Engineering Director at unicrew.

But what happens when those objectives are missing or unclear? “Picture this: you set out on a road trip without a specific destination. Would you end up where you wanted? Probably not. The same logic applies to software development. Without clear objectives, projects can quickly veer off course, leading to feature creep, delays, and budget overruns,” adds Ihor.

Here is a startling fact: a 2024 study by the Project Management Institute (PMI) found that 42% of projects fail due to a lack of clear objectives and milestones, almost half of all projects.

Imagine developing a simple task management tool. Because objectives were unclear, stakeholders kept adding new features until the team was building a full-scale project management suite. This happened to one company whose initial budget was $100,000 and timeline was six months. The final cost was $150,000 and 12 months, an increase of 50% in both time and money.

How can you keep your project out of this trap?

“Start by asking the right questions,” said Ihor:

• What exactly are we trying to achieve?
• How will we measure success?
• Are the goals realistic and relevant to our overall mission?

By defining specific, measurable, achievable, relevant, and time-bound (SMART) objectives from the outset, you keep everyone on the same page about the requirements of the software. Regularly revisiting and refining those objectives keeps the project on track and prevents costly deviations. Clear goals are not just nice to have, they are essential for guiding your project to success.

Mistake 2: Not involving key stakeholders

“Involving stakeholders early and often is not just a good practice, it’s a necessity,” emphasizes Oleksandr Trofimov, CTO at unicrew. “Their input ensures the product meets both user and business needs, making them an integral part of the development process.”

But what happens when key stakeholders are left out of the loop? Picture a house built without consulting the future homeowners. The result is a house that does not fit their needs or preferences, which then means expensive adjustments. “A similar situation happens in software development. If users, the main stakeholders, are not included in the requirements stage, the final product does not reach the functionality that end users are longing for,” adds Oleksandr.

Consider this: a software company rolled out a brand new customer relationship management (CRM) system expected to simplify sales activities, but skipped the sales team during the SRS phase. Soon after the software went live, it was difficult to handle and ran contrary to the sales team’s work habits. The consequences? An additional $500,000 was invested, and another six months went by to make substantial changes, hurting overall productivity.

Findings from the 2024 Standish Group report show that projects with high stakeholder involvement had a success rate of 76%, while projects with low stakeholder involvement succeeded only 29% of the time. The data underlines how crucial stakeholder support is, and how important it is to integrate them from the beginning.

How can you do better?

Start by identifying all stakeholders, such as users, managers, and customers, then get answers to questions like:

1. Who is going to be using this product?
2. Whose input is critical to the success of the project?

Get those answers from the relevant parties, and if they are the end users, engage as many of them as possible from the beginning until the work is done.

“By including the key stakeholders from the early stage, you build the product on a consensus of what users need and make sure business targets are achieved. It lowers the chance of spending extra money on the new system and helps the project succeed when it is first released,” adds Oleksandr Trofimov, CTO at unicrew.

Mistake 3: Overlooking non-functional requirements

“Security, scalability, and performance are not just buzzwords; they are the pillars of a robust software system,” asserts Oleksandr Trofimov, CTO at unicrew.

It is easy to focus on what a system does, but how it performs those functions under various conditions is equally important. That is what makes non-functional requirements matter so much in software development.

“Say a start-up decides to launch a new e-commerce platform and puts the emphasis on features like product listings and payment processing, while leaving aside non-functional requirements like scalability. The platform was very good at first, but as it became popular it started to struggle, overloading during heavy shopping and eventually crashing,” adds Oleksandr.

On top of that, during a big holiday sale the site traffic jumped by 10x. Because scalability was never planned for, server overloads and downtime followed, souring the mood of waiting shoppers. It took an extra $200,000 and three months for the company to restructure the system to cope with the increased load, which hurt user satisfaction and meant significant lost revenue for the holiday season.

A survey by Gartner in 2024 indicated that roughly 48% of ICT ventures trip over performance issues because non-functional parameters like scalability were not given enough attention. Disregarding minor details can sometimes have a drastic impact in a real scenario.

How do you avoid it?

Conducting requirements engineering work early on is crucial to avoiding dead ends. That means creating and documenting non-functional requirements, which is fundamental for building effective systems. Just find out:

1. How many users should we expect to handle at a single time?
2. Security?
3. What level of performance is acceptable under peak load conditions?

“Ensuring the technology can scale, is secure, and is functional guarantees the client a system that handles growth and meets user expectations, so they receive a faster and less risky user experience,” said Oleksandr Trofimov, CTO at unicrew.

Mistake 4: Using ambiguous language

“Precision in specification language prevents misinterpretation and costly errors,” says Andriy Burda, Senior Engineering Manager at unicrew.

Ambiguous language in an SRS document can lead to multiple interpretations, resulting in a product that fails to meet client expectations. Imagine a project where the SRS stated, “The system should efficiently handle a high number of user requests.” What does “large number” mean? And what exactly is “efficiently”? These vague terms led to different interpretations by the development team and the client.

“For instance, a software development firm had to develop an inventory management system. The SRS included the requirement, ‘The system should support many simultaneous users.’ The development team interpreted this to mean up to 100 users, while the client expected it to handle over 1,000 users. This mismatch was discovered only after deployment, resulting in decreased performance and user dissatisfaction. The company had to spend an additional $300,000 and four months upgrading the system to meet the actual needs, delaying the launch and straining the client relationship,” adds Andriy.

A 2024 poll by the International Institute of Business Analysis (IIBA) showed that 54% of project breakdowns were due to misinterpretation of the requirements, very often because of ambiguity in the language. Writing clear and explicit instructions in SRS documents is critical to setting proper ground for communication and making the project possible.

So what do you do?

“To avoid such issues, follow these tips,” said Andriy Burda, Senior Engineering Manager at unicrew:

1. Use specific, measurable terms. Replace vague language with clear, verifiable terms. For example, instead of “large number,” specify “up to 1,000 simultaneous users.”
2. Define performance metrics. Rather than saying “efficiently,” define specific performance metrics, such as “response time under 2 seconds for 95% of requests.”
3. Include examples and scenarios. Provide examples and scenarios to illustrate requirements. This helps ensure all stakeholders have a common understanding.
4. Review and validate with stakeholders. Regularly review the SRS with stakeholders to confirm that the language is clear and the requirements are understood uniformly.
5. Use standardized language and glossaries. Standardized terminology and a glossary of terms cut down on misinterpretation.
6. Document assumptions and constraints. Record any assumptions and constraints related to the requirements to prevent ambiguity.

By expressing clear, verifiable terms in your SRS and following these tips, you keep everyone aligned on the requirements and reduce the risk of costly errors and project delays.

Mistake 5: Failing to prioritize features

“Not all features are created equal; prioritizing helps allocate resources effectively,” says Ihor Prudyvus, Engineering Director at unicrew.

Failing to prioritize features can lead to wasted resources, missed deadlines, and project failure. Imagine a company developing a new customer service platform. The team focused on implementing low-priority features like advanced analytics and customizable themes early in the project, so high-priority features such as core ticket management and integration with existing systems were addressed too late. The project ran out of budget before those essential features were fully developed, leaving a platform that could not perform its primary functions effectively.

A report by McKinsey & Company found that well-structured projects with proper prioritization had a 30% better chance of finishing on time and within budget than projects without it.

How do you write requirements and avoid this pitfall?

“Here are some key strategies for prioritizing features effectively,” adds Ihor:

1. Identify business goals and user needs. Align features with overall business goals and end-user needs so the most critical aspects of the project are addressed first.
2. Engage stakeholders. Involve key stakeholders in the prioritization process to gather diverse perspectives and make sure all critical features are identified and agreed upon.
3. Assess feasibility and dependencies. Evaluate features’ technical feasibility and dependencies, and prioritize features that are foundational or high-impact with minimal dependencies.
4. Review and adjust regularly. Prioritization is an ongoing process. Review and adjust priorities regularly based on project progress, feedback, and changing requirements.
5. Allocate resources accordingly. Ensure budget, time, and human resources go to high-priority features first. This prevents resource exhaustion on low-priority tasks.

By prioritizing features effectively, you ensure that critical components are developed first, resources are used efficiently, and the project stays on track. This approach helps deliver a functional, high-quality product within the allocated budget and timeline.

Mistake 6: Neglecting to update the SRS

“An SRS isn’t a set-and-forget document; it evolves as the project does,” says Andriy Burda, Senior Engineering Manager at unicrew.

Failing to update the Software Requirements Specification after significant changes creates a disconnect between the project’s expected and delivered functionality. Imagine a tech company developing a mobile app that pivots mid-project from a general health tracker to a specialized fitness training tool. The team did not update the SRS to reflect that significant change. As development continued, discrepancies arose between what was being built and what stakeholders expected. The final product lacked essential fitness-specific features and included redundant health-tracking functionality. This mismatch led to user dissatisfaction and required an additional $150,000 and three months to rectify post-launch.

How do you keep the SRS current?

“To avoid such pitfalls, it’s crucial to keep the SRS up to date,” adds Andriy. Here are key strategies to ensure your SRS remains a living document:

1. Schedule regular reviews. Set regular intervals to review and update the SRS so it stays aligned with the project’s evolving goals and requirements.
2. Document major changes immediately. Whenever there is a significant change in scope, objectives, or features, update the SRS promptly to reflect it.
3. Engage stakeholders in updates. Involve all relevant stakeholders in the review and update process so everyone has a clear understanding of any changes.
4. Maintain version control. Use version control systems to track SRS changes. This keeps a clear history of modifications and ensures everyone works with the latest version.
5. Communicate updates clearly. When updates are made to the SRS, communicate the changes clearly to the entire team, including detailed explanations of what changed and why.
6. Align updates with development milestones. Sync SRS updates with key development milestones so the document stays relevant and reflects the current project status.

“By keeping the SRS alive and evolving with the project, you can prevent misunderstandings, ensure all team members and stakeholders are on the same page, and deliver a product that meets expectations. This approach mitigates risk and enhances the project’s overall success,” said Andriy Burda, Senior Engineering Manager.

Mistake 7: Insufficient detail

“Every detail might seem minor individually, but collectively they define the system’s success,” says Ihor Prudyvus, Engineering Director at unicrew.

An SRS that lacks detail invites misunderstandings, misinterpretations, and extensive rework during development. Imagine a software company developing an online learning platform. The SRS vaguely described the user authentication process as a “secure login.” It did not specify the type of authentication method, the security protocols to be used, or the integration with third-party identity providers. During development, the team implemented a basic password authentication system, believing it met the requirement. When stakeholders reviewed the progress, they realized the system did not support the multi-factor authentication (MFA) they expected. This oversight led to significant rework, costing an additional $100,000 and two months to implement the necessary security features.

How do you add the right level of detail?

“To avoid such scenarios, it’s crucial to ensure your SRS is detailed and comprehensive,” adds Ihor. Here are some practical tips to achieve this:

1. Break down requirements. Turn high-level requirements into detailed, actionable items, such as environment-specific requirements for each use case. Specify the environment and infrastructure needed to run the software so there is a vivid picture of what needs to be done: the why, how, and who where possible.
2. Include detailed descriptions. Cover all the features, functions, and constraints with a purpose-oriented interface. For example, instead of the short “Login to a secure area,” use a more detailed statement like “log in via multi-factor authentication using email verification and the OAuth2 protocol.”
3. Use diagrams and models. Visual tools such as activity flow diagrams, wireframes, and use case diagrams can clarify intricate requirements and ease comprehension of system interactions.
4. Specify acceptance criteria. Determine crystal-clear acceptance criteria for each requirement. This creates a common understanding of when a requirement is fully met and acceptable to all parties.
5. Review and refine. Continually refine the software requirements document with stakeholders and team members, using questions like “Are all the specifications of the SRS clear to the stakeholders?” and “What new insight could be added to the document?” Keep refining based on the suggestions you receive and your own reflections.
6. Create a glossary of terms. A glossary of technical terms, acronyms, and jargon clarifies the context and ensures everyone understands the requirements the same way.

“Concentrating on detail and transparency in your SRS can reduce the chances of expensive, time-consuming rework and put your project on a smoother track. Remember that the devil is in the details, so thorough documentation of the entire system is a good pointer to a successful project,” says Ihor.

Final thoughts on software requirements specifications

Completing a strong Software Requirements Specification and avoiding these common pitfalls will shape the result of any software development project. Clear objectives, stakeholder consultation, non-functional requirements, exact language, prioritized features, regular updates, and a detailed specification document are the backbone of a solid SRS plan. Each characteristic is essential for completing the project on budget and on time, and for keeping the stakeholders involved satisfied.

Ready to elevate your software development process? Contact us today for a detailed audit of your software requirements processes. Our experts can help you identify gaps, refine your requirements, and set your projects up for success.