Best Practices for Verification and Validation in Product Development

In the competitive landscape of modern product development, ensuring the reliability and quality of the product is essential to meet customer – and stakeholder – expectations and regulatory requirements. Verification and validation (V&V) are two crucial processes that play a pivotal role in achieving these goals. V&V are systematic methods that assess a product’s adherence to specifications and its ability to perform as intended. In this article, we will delve into the best practices for verification and validation in product development, exploring the key steps, methodologies, and benefits of each process.

Understanding Verification & Validation

Before delving into the best practices, it is essential to clarify the distinction between verification and validation. Verification focuses on assessing whether a product meets its design specifications, ensuring that each component and feature works as intended. On the other hand, validation is concerned with evaluating whether the product fulfills its intended use and customer needs. In essence, verification confirms if the product is designed correctly, while validation confirms if it is the right product for the intended application.

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Incorporating V&V Early in the Development Lifecycle

To maximize the effectiveness of verification and validation, these processes must be integrated into the product development lifecycle from its early stages. By starting V&V activities early, potential issues can be identified and resolved before they escalate, reducing costs and time-to-market. Early involvement also allows for feedback to be incorporated into the design, leading to a more robust and reliable final product.

Clearly Defined Requirements

Well-defined requirements are the foundation of successful verification and validation. During the requirements gathering phase, it is vital to engage stakeholders and subject matter experts to create clear, measurable, and unambiguous specifications. These requirements serve as the baseline against which the product will be verified and validated. Proper documentation and version control are critical to ensure that changes to requirements are tracked effectively. Additionally, the later in the development process that requirements get changed, many times because they weren’t written well the first time, the more costly it is due to downstream impacts such as rework in verification and validation.

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Utilizing Various V&V Techniques

Product development teams should employ a mix of V&V techniques to comprehensively assess the product’s quality. Some commonly used methods include:

• Testing: Conduct thorough testing, including unit testing, integration testing, system testing, and user acceptance testing, to verify that each component and the product as a whole performs as expected.
• Simulation: Use computer simulations to evaluate the product’s behavior in various scenarios, particularly for complex systems or when physical testing is impractical or cost prohibitive.
• Prototyping: Building prototypes early in the development process allows for real-world testing, uncovering potential design flaws and usability issues.
• Peer Reviews: Encourage regular peer reviews of design documents, code, and other artifacts to catch errors and improve the overall quality of the product.
• Model-based Design: Utilize model-based design approaches, such as Model-Driven Architecture (MDA), to create detailed models that can be verified before implementation.

Risk-Based Approach

Incorporate a risk-based approach into V&V activities to focus resources on critical areas. Identify potential risks associated with product failure and prioritize verification and validation efforts accordingly. This approach ensures that resources are allocated efficiently, concentrating on areas with the most significant impact on product performance and safety.

Independent Verification and Validation (IV&V)

Consider engaging external experts or teams for independent verification and validation. External parties can provide an unbiased assessment of the product, uncovering issues that internal teams might overlook due to familiarity or assumptions. Independent verification and validation bring additional expertise and ensure a higher level of confidence in the product’s quality.

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Continuous Integration and Continuous Delivery (CI/CD)

Implementing CI/CD practices allows for continuous verification and validation throughout the development process. Automated testing and deployment pipelines can quickly detect regressions and integration issues, ensuring that the product remains stable and reliable throughout its evolution.

Documenting V&V Activities

Comprehensive documentation of all verification and validation activities is essential for compliance, knowledge retention, and continuous improvement. Properly documented V&V processes help maintain a historical record of changes, failures, and resolutions, facilitating future product iterations and troubleshooting.

V & V are integral to successful product development, ensuring that products meet the required specifications and perform as intended. By adopting best practices such as early integration, clear requirements, a mix of v&v techniques, risk-based approaches, and continuous verification, companies can create high-quality, reliable products that customers love and gain a competitive edge in the market. Moreover, investing in verification and validation from the outset of development can save time and resources, prevent costly delays, and lead to higher customer satisfaction and loyalty in the long run.

If you’ve heard the terms “verification” and “validation” used interchangeably, you aren’t alone. However, this creates confusion during the testing process, and if you’re building products in highly regulated industries, it’s critical that products perform as expected and expensive errors are avoided.

Unclear and incomplete requirements can be frustrating for software developers, and if developers can’t get the required information up front, they must make interpretations, which aren’t always correct. The result is higher risk of errors and extra resources spent fixing issues further into the product development cycle.

Understanding the difference between verification and validation and how to use each during product development helps reduce cost, increase efficiency and deliver a product that better fits user requirements.

What is requirements verification?

If you’ve used verification and validation interchangeably in the past, one of the most important things to note is order. Software verification comes first, followed by validation. But what’s involved with each? Let’s dive into verification first.

Verification tests check to ensure the program is built according to the stated requirements. The verification process includes activities such as reviewing the code and doing walkthroughs and inspections.

Missing requirements or invalid requirements can be discovered during this phase, which can minimize risk of rework and the cost associated with overruns. It’s far more effective to fix a small bug up front than in the future when hundreds of lines of code must be identified and corrected.

For example, imagine that you’re driving to a new destination. You might plug that destination into your GPS, which provides directions and the freeway exit number. If you’re looking for exit 10 and just passed exit 1, you quickly know you have nine more exits to go. Using the GPS allows you to check your existing path against the directions, which is similar to the verification phase.

Another example is entering a formula into a spreadsheet. After entering a few rows of data, you might check the formula and make sure that it’s working. The process of verification is the same in that it allows you to do a quick check before getting too deep into the product development process.

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What is requirement validation?

After you’ve completed verification, it’s time to complete validation testing, which confirms the accuracy of the requirements. It ensures that the requirements have achieved the business objectives, meet the needs of any relevant stakeholders and are clearly understood by developers. Validation is a critical step to finding missing requirements and ensuring that requirements have a variety of important characteristics. Software validation addresses the following:

• Correctly outlines the end user’s need.
• Has only one exact meaning.
• Can be modified as necessary.
• Documents the attributes that customers truly need.
• Easily linked to system requirements, such as designs, codes and tests.
• The ability to implement can be verified through testing, inspection, analysis and demonstration.

Validation isn’t focused on the path that you traveled to arrive at the destination but is instead focused on whether you’ve hit the mark. For example, consider the last example of a person traveling in a car and tracking landmarks, such as exit numbers. Let’s say the goal is to arrive at a hiking trail. A few questions might be asked when you arrive.

• Does the hiking trail look as expected?
• Can I see a marked trail and trailhead sign?
• Does the location meet my expectations?

Verification validation is focused on the same types of questions. It’s not concerned with how you got there, but that you arrived at the correct location.

If you’re designing a spreadsheet, as we discussed before, you checked that the formula worked during the verification process. During validation, you’re making sure the end product (the spreadsheet) meets the needs of the user.

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Verification and validation: What’s the difference?

As you consider validation vs. verification, you might feel unsure about the differences. What activities fall under the category of validation and which fall under verification, and when should you perform each?

Let’s say that you’re working to create a product and it’s time for verification testing, since verification always comes first. During this process, you check documents, design, code and the program to make sure the software is built according to requirements. The goal is to ensure the quality of the application or design. You might conduct activities such as reviews, walkthroughs or inspections.

Now, it’s time to move on to validation verification. During this process, you’re testing and validating whether the product meets the needs of your customer. Tasks in this process may include unit testing, integration testing or user testing. Here are more differences between verification and validation.

• The verification process does not include code. In contrast, validation includes executing relevant code.
• Methods used during each process are different. Verification might include reviews, walkthroughs and inspections. Validation might include white-box testing, black-box testing and nonfunctional testing.
• The verification process ensures that software meets specifications. Validation focuses on whether the software meets the expectations and requirements of the end user.
• Verification finds potential issues early in the product development process. Validation finds any issues that verification missed.
• Validation focuses on the actual software product, whereas verification is focused on the software architecture, database and design.

Let’s look at another example of verification and validation in software testing. Imagine that you’re working on creating a clickable website button with the text “click here,” but the existing text actually reads “click her.” The verification process would check the document design and fix the spelling mistake. Once fixed, validation would occur, which would check the functionality of the button. Does it work how a user expects it to work? If not, the functionality would be remedied during this phase.

RELATED POST: Nonfunctional Requirements vs. Functional Requirements – What’s the difference? 

Streamlining Collaboration During Verification and Validation with Software

For system engineers, being able to trace relationships between data types is essential. However, there can be a problem with multiple levels of requirements, specification and verification artifacts all having their own set of stakeholders who are performing a variety of tasks.

The right software solution can simplify complicated situations and enable you to add traceability of the data. You can analyze the “who, what, where and why” of potential changes and make sure that essential data doesn’t get overlooked. Look for a software solution that does the following:

• Connects test cases from a problem statement to your requirements and design. If you don’t have the ability to do this, you can’t be sure that you haven’t overlooked something critical.
• Connects system requirements to business and stakeholder requirements. If you miss a critical connection, you risk unplanned expenses that may have a ripple effect and create slowdowns in product launches, weaken stakeholder confidence and adversely affect the bottom line.
• Improves decomposition. It’s critical to relate lower-level requirements to higher-level requirements to ensure that components and subcomponents all come together into a functional system. Mistakes in this area may lead to extra costs as you work hard to put the pieces back together and implement changes later in the product development process.

A software solution is a critical tool in helping you manage the verification and validation process and ensure that every engineering activity is connected throughout the entire system life cycle. It’s critical to capture all communication in context and bring stakeholders together in one place for a real-time and comprehensive look into what teams are building and why.

Moving Into the Future

Testing can be one of the most expensive parts of product development, without proper planning. It’s important to incorporate verification and validation to ensure cost savings and a high-quality product. In the end, if the product doesn’t meet the original objectives, then time, money and effort are wasted.

Fortunately, companies can get products to market faster when people and data stay in sync with product development activities and deliverables. Using innovative software tools can easily shorten the time from ideation to value creation and performance.

See how Jama Connect streamlines requirements verification and validation. 

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