Why Is Quality Assurance Important? Guide to Software Testing

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Are you wondering why quality assurance is important? Then, you should recall when you had to hit “save” every couple of seconds because the software could glitch and erase all of your work.

Does it happen to your customers?

Then they will defect to your competitor before you can blink an eye and keep your tool a wide berth. The same will probably happen if your app takes ages to load or crashes at the rise of traffic. And you certainly don’t want it to leak your customers’ data.

But how can you ensure your digital product functions as intended under all circumstances?

The answer is—Quality Assurance.

Put simply, software quality assurance (QA) is a process that focuses on identifying the requirements for creating reliable, secure, and stable software and ensuring the end product meets those requirements. 

Further in this post, you will learn about the importance of quality assurance in software development, the benefits of quality assurance, what testing is, its types, and classification. After reading, you will be able to evaluate the importance of software testing for your project and the effectiveness of the methods offered by your QA team.

For those in a hurry: the main reason why QA is important for your software development project is the guarantee that everything that happens throughout the development process is done effectively. And that the process is repeated without any deviation for all software parts.

What makes us an expert

At Syndicode, quality assurance and testing in software development are indispensable. Let’s take one of our ongoing projects, Evrlearn. We performed thorough requirements and functional testing of every feature upon its completion. This way, we ensured that everything we did in the project looked and worked as intended under all possible user scenarios.

Besides, we saw that all system modules worked well together through integration testing. In particular, API testing validated the logic of the built architecture in practice and that all the platform features were easy to access. 

As a result, currently, the website requires minimal technical support to keep up to date with the changing technologies and industry standards. We have a stable solution that provides excellent UX for users and scales easily according to the business needs.

Evrlearn case study
Evrlearn platform by Syndicode

The role of QA and testing in software development

Putting quality first makes everyone in a business focus on defect-free results. In terms of development, software testing services involve implementing effective routines that foresee the possible problems and prevent the need for workarounds.

Companies that realize the importance of quality assurance encourage employees to look at every part of the software development process as a “product” that has its “consumer”. Thus, a business analyst provides information to project managers, designers, and developers. A designer creates a product to be used by developers, who will turn visuals and wireframes into a working code, and so on.

Defects are possible at each stage, so it’s important to ensure all participants adhere to the quality standards.

What will happen if you neglect QA? Software bugs are known for causing the losses of millions of dollars, like Nissan’s airbag software issue or Starbucks serving coffee for free due to a mistake in its POS system. 

But even if the worst thing a malfunction can do is disappoint a user, it still leads to major reputation losses. Equifax, an American credit reporting agency, is still recovering from the security breach caused by a bug in 2018 that caused a 28% share fall.

QA benefits
Benefits of QA in software development

Objectives of QA

One of the major reasons why quality assurance is important is that it works towards the standardization of software development processes. A consistent result is impossible if a function operates differently depending on who does it and when. The solution to this problem is to clearly explain the desired outcome under a certain condition.

This way, a digital product is created with quality already “built-in”, rather than going through the product’s constituents and trying to bring them up to the desired level after the development is finished. The latter also happens if the quality assurance process was implemented at the very end of the ​​software life cycle process.

Another QA objective is to limit variation where it’s unavoidable by outlining the limits of normal variation and those that represent a problem. Finally, and maybe most importantly, QA aims to deliver maximum value to the end-user. In some cases, everything that doesn’t bring any value should be removed.

QA vs. QC vs. testing
QA, QC, and software testing

The difference between QA and software testing

When discussing the importance of quality assurance, people often use “quality assurance” and “software testing” interchangeably. In fact, there is a difference.

QA is an effort to implement and improve digital quality throughout the software development lifecycle. What happens after a product has already been developed is called quality control (QC), a set of activities aimed to ensure the product meets the customer’s criteria. As a part of QC, there is testing, which is planning and executing tests to meet the goal of QC. But why do we need software testing if there is quality assurance?

The software testing definition can be formulated as follows. Software testing is finding errors in the developed product and matching the outcomes with the expected results. The main difference between testing and QA are:

  • Quality assurance helps to identify and prevent possible issues before they appear. In contrast, software testing aims to detect defects and ensure they are fixed.
  • QA is focused on end-user satisfaction, ensuring the product’s features and functions meet the client’s requirements. At the same time, software testing focuses on test cases and their implementation to properly search for defects.
  • Software quality assurance has a lot to do with management, involving creating policies, training, selecting tools, and team building. Testing in software engineering, though, is a process of writing different tests to find different bugs.
QA and QC
Quality control vs. Quality assurance

When should you implement QA in your project?

While we strongly recommend introducing quality assurance as early as possible, sometimes the importance of quality assurance becomes diminished by a limited budget or other factors. If that’s the case, you can do it at any stage of the software development lifecycle. Often, testing starts only after the code is completed.

In this case, the main focus is on the functionality and each feature working properly. However, it’s impossible to do an all-inclusive check of code which may affect the system stability.

Also, when emphasizing functionality, it is easy to lose the full scope of why the feature was built. As a result, the software might not fully reflect the client’s intentions.

Starting QA at the discovery and design phases allows the QA team to understand better the product’s goal and the reasoning behind each feature. This way, they can come up with the most efficient way to implement and incorporate UX into testing. Eventually, the product has a higher chance of being satisfactory both in functionality and user experience.

Benefits of quality assurance

Regardless of when you decide to start QA in the software life cycle, it will improve the quality of your digital product. Quality assurance practices increase the relevance of software testing methods, aligning them with the overall development strategy. The following benefits add to the importance of quality assurance.

Resources saving

The major reason why quality assurance is important is that a bug found early can cost nothing to fix. But the same bug hidden within billions of code lines requires time to be identified and can delay delivery. The increase in time, in turn, increases costs logarithmically.

Moreover, if not found, a bug may cause tremendous harm after release, from a malfunction to system failure. In that case, you will have to call your product back for more thorough testing and rework, which means more expenses and reputation losses.

Enhanced security

Code quality and security are two sides of the same coin. Whereas a user sees a usability issue, a cyber attacker sees an opportunity they can use to stress the system. Therefore, the better the code quality, the more predictable its behavior and the fewer system vulnerabilities.

There is also a separate type of testing in software engineering aimed at validating a product’s security. Security testing focuses on detecting network weaknesses and can involve so-called ethical hacking to expose potential security flaws.

UX improvement

If the software is challenging to use, tends to crash, is unclear about the next step of the user journey, or there are just too many buttons, the customer will be unlikely to do business with you again. One of the benefits of quality assurance is minimizing the risk of having those issues.

For example, user-based testing determines how users interact with real concepts and identifies friction before they are built. And functional testing enhances back-end functions and detects problems with the front-end interface before the product goes into production. 

Still not convinced about the importance of quality assurance?

Faster development

If software testers work in parallel with developers, they find defects and report them to be fixed as soon as the next unit of the system is completed. This allows developers to go back and fix everything quickly while the code is still fresh in their memory.

One more reason why quality assurance is important lies in the cooperation between development and testing teams and providing a plan of consistent fixes. This way, no one has to deal with constant errors and frantic communication.

Simpler features adding

The older the code and the more interconnected its parts, the harder it is to add new functionality without breaking anything. Testing in software engineering helps developers know about the crucial parts of the code and boosts their confidence. A new development team will know where to look if something goes wrong after building another feature and will appreciate your understanding of the importance of quality assurance.

Start creating a high-quality product
Syndicode’s knowledgeable QA specialists make an extra effort to ensure 100% coverage with tests.

What should you know about software testing?

Now that you see why quality assurance is important, let’s talk about its subset. Software testing is classified by type, method, technique, and testing level. Thus, different types of testing in QA describe the intention of the performed testing: to check the system’s performance or the adherence of its parameters to a standard. 

Methods differ by the amount of the tester’s interaction with the system. A certain software testing technique is used to assess different parts of the tested system. And testing levels describe what exactly was tested: the structure of the system part, its behavior, or interaction between several units. 

The following software testing set is commonly used for an average software product.

Testing levels:

  • Component testing
  • Integration testing
  • System testing
  • Acceptance testing

At each level, the following testing types can be applied:

  • Functional testing
  • Non-functional testing
  • Change-related testing
  • Testing by knowledge of the system

Software testing methods:

  • Static testing
  • Dynamic testing

Testing techniques:

  • Black-box testing
  • White-box testing
  • Experience-based testing

Now, let’s look at each level, type, method, and technique in more detail.

Software testing hierarchy
Types of software testing

Types of testing in software engineering

Manual testing

Manual testing involves a human tester checking a new system’s functionality using no readymade tools. The benefits of testing software manually are indisputable. There is the need to check the convenience and user-friendliness of an interface, verify a system’s performance under different scenarios and user behaviors, and shape an overall opinion about an application.

The main disadvantage of manual testing is that it’s time-consuming. Hence, it’s impractical to use for load testing, regression tests, and where there is the need to find slight differences among multiple similar objects.

Automated testing

Automated tests are fast and can repeatedly run without losses in productivity or accuracy. Yet, because of the high cost of automation tools, this testing type makes sense to apply for large long-term projects requiring repetitive testing. Also, there are some areas that cannot be automated, such as UX or complex functionality. 

Similarly, it’s not reasonable to perform automated testing when software is still under development since the tests will require frequent updates, which may take more time than a manual check.

Testing methods

Static testing

This testing method is applied early in the development process before there is any completed module to execute. It aims to ensure all the project documentation is available, clear, and implementable. 

Static testing is also used for code inspection for syntax, adherence to standards, and optimization. This testing method can cut the probability of flaw emergence by 85%.

Dynamic testing

In dynamic testing, the code is executed to check software performance in a run-time environment. The testing ensures that an app’s behavior, CPU usage, and overall performance meet the expectations. It also identifies weak areas, yet static testing is necessary to trace vulnerabilities.

Testing techniques

White-box testing

White-box testing examines program structure and makes conclusions based on the system’s logic. A test case repeatedly runs a code with given input values and compares them with the output. If the values don’t match, then it has a bug. 

This testing technique allows for checking individual code sections and how they link to others before any GUI is built. It is also very thorough. However, white-box testing won’t tell you if an expected functionality is absent from the code, and it is hard to do manually.

Black-box testing

Black-box testing is a functional testing technique that “doesn’t care” about the internal system processes. A tester simulates user activity and sees if the system returns the expected result. For example, using the black-box technique, one can verify whether it’s possible to log in using the right credentials and not possible to log in with the wrong credentials.

Black-box testing effectively validates the system’s response times, usability, and reliability under different user actions. However, this technique doesn’t expose security vulnerabilities or data flow issues.

Testing levels

Unit testing

Testing individual components of software helps developers learn what functionality is provided by an individual module of an existing system in a case when a new team takes on development. Further, since each module is tested in isolation, possible breaking points are detected easily. Also, unit testing helps to control the code complexity, contributing to clean and efficient choices.

On the cons side, unit testing is time-consuming, can’t be used for legacy code, and is not applicable for GUI.

Integration testing

The goal of integration testing is to ensure third-party integrations work with the internal system elements as they should. A module can work well in isolation but return errors while interacting with another module. Testing at this level is crucial when different developers or teams create the system parts to validate there wasn’t a mismatch in requirements understanding.

The primary disadvantage of integration testing is that it is time-consuming.

End-to-end testing

Testing the entire application from start to finish from the end-user’s perspective is the goal of end-to-end testing. To check the app’s behavior and the integrity of its components, a tester imitates a real user scenario. The testing increases confidence in the product for release and minimizes the risk of failure.

Unfortunately, in case of E2E testing failure, unit or integration testing is needed to find the root of the issue. Also, it might be difficult to fully re-create the environment for a real-world scenario.

Acceptance testing

Acceptance tests ensure the application provides valuable functionality to end-users. Typically, this is the final step of software testing, and a focus group of real customers is invited to perform the tests. A product that passes acceptance testing can be considered adequate and market-ready.

On the other hand, it is often difficult to write tests that are not overly technical for the customers. And since testers are only looking for defects they expect to find, some underlying issues may be missed.

The BDD cycle
QA and development

Syndicode’s approach to software testing

Being a full-cycle custom software development company, we stress the importance of quality assurance and strive to introduce QA as early as possible in the software life cycle. This way, we minimize the need for rework and cut the associated costs for development. 

Thus, starting at the project requirements gathering stage, our QA engineers analyze the functional and non-functional software requirements for clarity, completeness, traceability, and testability.

Based on the gathered requirements, we create a test plan. It contains a test strategy, scope, budget, and deadlines and describes the necessary types and levels of tests, procedures, and resources.

Next, we design test checklists. A checklist outlines lists of items to be tested and the passing criteria. Then we plan and set a test environment that closely mimics the production environment in terms of hardware, software, network configurations, operating system settings, databases, and others.

Test execution starts with unit testing performed by the development team. A developer completes a system unit and checks if it functions properly right away. The testing team takes over UI and API testing. After a defect is found and fixed, we run regression tests to ensure the change doesn’t affect the related functionality.

Once the product is ready for release, the test team determines the test suites necessary to cover the scope of the deployed build. We check the system for stability, and if all the tests are passed successfully, we issue a test report.

The procedure has been time-tested and proven efficient for our projects. Client reviews confirm that software developed by the Syndicode team works perfectly for their business goals. Our solutions provide reliable assistance in solving problems and are effective growth boosters.

So, why is quality assurance important?

Software quality assurance stimulates your team to analyze errors and improve them before the product reaches customers and hurts their satisfaction and loyalty. The quality assurance process aims to guarantee that a software product will work per the expectations without any problems.

Assembling a QA team requires investments to search for the relevant expertise and equipment purchasing. While this is justified for long projects, you can outsource QA from a trusted web development partner for short or one-time development. Why is quality important for a business? Without it, you risk getting a product that behaves unexpectedly should something deviate in its environment. A sloppily made product is hard to update, and there is a high chance that should you want to add or remove something, you’ll have to rebuild the entire system from scratch.


  • Quality control is a part of QA that focuses on the output. It is a process of measuring the product quality, verifying if it’s good enough or needs improvement. The benefits of quality control are the assurance that defective products do not go out to the customers and better control over the employees’ work.

  • As soon as people discover why quality assurance is important, they start wondering about its cost. The latter depends on several factors such as the QA expert’s qualification, the project complexity, the market, and the deadline. Thus, the longer the project and the earlier you start quality assurance, the costlier it will be. Usually, the cost of quality assurance is 20%–30% of the development cost. On the other hand, early QA mitigates the risk of recalling your product because of poor quality. Both are things to weigh thoughtfully. The larger your QA team, the more you have to spend on salaries. According to, a QA team lead’s hourly rate in the United States typically falls between $40–$55. A QA engineer charges $29–$36 per hour. And a QA tester’s rate ranges between $15–$20 per hour. Depending on your project, you may need a bigger proportion of senior engineers as testers, increasing the project cost. However, if you outsource QA, you can hire your team in Europe and cut the QA costs by at least half.

  • Finding a QA partner that meets your business needs among all the noise is difficult. However, there are some indicators of robust expertise and proficient use of modern technology: Extensive resume. A company experienced in quality assurance will have a lot of cases to show. Read through them to ensure they provide the type of services you’re looking for. Client reviews. Check if the company managed to add value and if their work style meets your expectations. It would be best if you also looked for a confirmation of their adaptability to different testing environments and changing technology. Curiosity. If the previous two points are covered, contact the company’s representative and tell them about your project. True professionals will typically ask a lot of questions like: What do you expect from the product in terms of quality? What value should the product bring to end-users? Who is the target audience? A good QA vendor will want to know as much as possible about your project to deliver better services. Transparent pricing. Check out the potential partner’s rates and compare them to the market average. Remember that a good specialist doesn’t charge low. At the same time, the most expensive doesn’t always mean of the highest quality. Finally, you should assess how you feel when talking to the potential vendor’s representative. Do you feel understood? Does everything they say make sense to you? You’re going to spend a lot of time discussing work-related issues, so you should feel comfortable asking questions and making suggestions.

  • Many business owners realize the importance of quality assurance but don’t have the resources to do it in-house. But is it safe to give away control over your quality control? First, unless you produce software pieces regularly, you probably outsource your development to an agency or a freelance team. Your development partner likely has the resources for basic software testing already. It will be easier for them to implement QA than for you to hire and train a QA team from scratch. Next, quality assurance requires expensive technology to be done right. Again, since your development partner already has tools for software testing, it will be easier for them to invest in the lacking equipment. In a nutshell, software development and QA go hand in hand, so we recommend that you contract a full-cycle software development company with QA incorporated into its services. At Syndicode, we build software from scratch using Agile principles. We follow an iterative approach and test software modules as soon as they are completed. This way, our products come with quality already built-in and perform flawlessly in favor of our clients and our own reputation.

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