Differentiate Between Quality Assurance, Quality Control and Software Testing

by Valeriia P. & JoinSoft Team
by Valeriia P. & JoinSoft Team
Marketing & Business Development Specialist
20 May 2021
Reading Time: 13 minutes

Quality Assurance (QA), Quality Control (QC), and Software Testing are the three things any technological product can’t do without. Though they seem similar and have a shared mission, which is to ensure end users are satisfied, and the business goals are met, QA, QC and testing shouldn’t be confused.

Think of a Swiss watch, for example – a symbol of quality and high status. When you buy Rolex, you expect it to be  flawless. Thus, to have revenues like Rolex does, you have to be the Rolex of your niche.

The goal of this article is to explain the difference between Quality Assurance, Quality Control and Software Testing. Furthermore, we dive deeper in each of them, compare and contrast them showing their importance for developing software.



What is Quality Assurance?


Quality Assurance is a proactive process that ensures that all the necessary techniques, procedures, standards and methodologies are followed during product development. The purpose of QA is to improve development and testing processes and thus, exclude defects by setting up a proper quality management system to ensure compliance to technical requirements.

A QA team collects and analyzes statistical data to identify possible gaps and optimize the development process whenever it is necessary. QA concerns each stage of the development process, from pre-design to product release.

The main task of a QA specialist is to prevent defects and, therefore, to ensure the high quality of the development process and its results.


To be more specific, QA specialists’ responsibilities are the following:

  • Help define the requirements for the project;
  • Asses risks related to the product;
  • Identify weaknesses and inconsistencies in the product at all stages of development;
  • Provide comprehensive information about quality of the product;
  • Test the product throughout all stages of the software development lifecycle.


After all, Quality Assurance advantages include:

  • Early detection and prevention of product defects;
  • Closer collaboration between testing, development, and management functions;
  • Competitive advantage as a result of enhanced product quality.


In general, Quality Assurance exists to make sure you do the right things, the right way.


At JoinSoft, we use the latest technologies and an individual approach to provide superior Quality Assurance services to our clients.



What is Quality Control?


Quality Control is a reactive process, the purpose of which is to verify the compliance of the product with the functional requirements through testing and troubleshooting. QC is a detection in nature: it is intended to identify product flaws after the product development but before the release.


While Quality Assurance ensures the correctness and predictability of the development process, Quality Control guarantees the product’s compliance with requirements. In other words, Quality Control confirms that the achieved results meet the expectations. After detecting a software issue, QC makes sure it will not appear for the second time.


Not only Quality Control ensures compliance of the product with requirements but also with a predetermined level of quality and readiness for release. The main task of QC is to provide a picture of what is happening with the quality of the product at different development stages. Thus the basic tasks of quality control include:

  • Analysis of software readiness for the upcoming release;
  • Analysis of the current conformity of the quality of the created project to the originally declared requirements.


The advantages of QC are compelling and come as follows:

  • Encouraging team’s focus on product quality;
  • Reducing production costs;
  • Minimizing post-delivery complaints.


Ultimately, Quality Control makes sure the results meet the expectations.



What is Software Testing?


Software Testing is the primary activity aimed at identifying and resolving technical problems in software source code and assessing the overall usability, performance, security, and compatibility of a product.

Basically, testing is a subset and integral part of Quality Control. It ensures the product functions as designed.

Just like Quality Control, testing is a reactive work (check – describe defects – fix), which helps fix defects in developed software – not more, not less. Thus, the main task of testing is to identify errors and fix them. Most importantly, Software Testing allows detect and fix bugs before software release.


Here are the benefits of Software Testing:

  • Enhanced product quality;
  • Increased customer satisfaction due to smooth user experience;
  • Cost-efficiency, since the earlier the bugs in software are detected, the less it costs to fix them;
  • Security, since testing helps to minimize risks and avoid problems earlier.


Software Testing is extremely important, as bugs, errors or gaps in a system may be really expensive or even crucial to further development. They say wise people learn from other people’s mistakes. Well, let’s have a look at how poor software quality and absence of harmonized testing resulted in substantial monetary loss:


  • In April 2015, a Bloomberg terminal in London went down due to a software glitch affecting more than 300,000 financial market traders. This forced the government to postpone the sale of the £3 billion debt.
  • In 2016, SolarCity Corp retained an investment bank to help sell Tesla Motors Inc. However, after the signing of the $2.6 billion agreement, an investment bank Lazard Ltd. found that they had underestimated SolarCity Corp by about $400 million.
  • Starbucks had to close about 60% of stores in the US and Canada due to a software glitch in its POS system. At some point, the company served coffee for free as they were unable to process the transaction.
  • In 2016, a group of hackers took over the Bangladesh Bank System and successfully stole over $81 million. They had another $870 million coming, but a spelling error canceled these additional transfers.
  • Some third-party Amazon retailers experienced a drop in their prices to 1 pound due to a software error. We guess, their satisfaction as customers after unexpected huge losses experienced a drop as well.


To cut a long story short, the necessity of a thorough Software Testing cannot be overrated.


JoinSoft provides free Software Testing services to detect bugs and check actual software performance. Then, we advise you on how to make your website or app work better.


Now that we know what Quality Assurance, Quality Control, and Software Testing imply, we can build a model of the hierarchy of quality assurance processes: testing is a part of QC; QC is a part of QA; and both Quality Control and testing are parts of Quality Assurance, while Quality Assurance itself goes along all phases of software development life cycle (SDLC).

differene between quality assurance quality control and software testing



Difference Between Quality Assurance and Software Testing


Surprisingly, quite a few IT-guys can explain the difference between QA and software testing. Many vacancies for testers sound like “QA required” or “QA tester required”. Well, something’s definitely wrong here. Let’s find out what exactly.

Both Quality Assurance and Software Testing help improve the quality of a product, but QA is more about improvement areas, and testing is about finding bugs. QA is essentially preventive in nature. Let’s say, the task of a QA engineer is to leave a tester with less work to be done.

QA monitors the testing process and verifies that software can operate under certain conditions. Testing focuses on case studies, implementation, and evaluation.

Therefore, QA is process-oriented and is expressed in process evaluation and audit, on the one hand. On the other hand, testing is product-oriented and deals with a result of the development process.

Find a short but comprehensive comparison of differences between Quality Assurance and Software Testing in the table below:


Quality Assurance Software Testing
Place in SDLC hierarchy A subset of SDLC A subset of QC
Orientation Process-oriented Product-oriented
Focus Quality evaluation and compliance with the requirements System inspection and troubleshooting
Purpose To ensure smooth compliant processes to achieve the necessary quality level To validate a product against specifications
Activity type Preventive Corrective
Time of application Throughout the development process At the testing stage or along with the development process



Difference Between QA and QC in Software Testing


Quality Assurance and Quality Control may seem interchangeable, however, there are many distinctions in their objectives, focus, breadth, activities, and completion times. What is the difference between QA and QC?

differene between quality assurance quality control and software testing


  • QA is a list of proactive measures that focus on prevention of defects, while QC is a set of reactive measures that focus on the process of finding and eliminating defects. Hence, the main purpose of QA is to assess what can go wrong before and during the SDLC by setting criteria for the final product.
  • Quality Assurance includes planning, documenting, and implementing recommendations that improve the quality of development processes. QA planning needs to be done early in the project to define software specifications. Furthermore, QA deliverables include validation of the development process, test plans, and customization of tracking tools.


Quality control, on the other hand, includes activities aimed at determining the level of product quality. When performing QC, all the standards and policies set by the QA should be followed. Additionally, Quality Control involves the use of various types of testing (unit, integration, vulnerability testing, etc.), the use of testing metrics and reports. Methods for measuring quality should be agreed before starting a project, as some tests and testing metrics are applied to improve the efficiency of the entire SDLC process, but not only the final product.


  • QA procedures are performed by all members of the development team during the software development life cycle, while QC is the work of the testers team only that they perform during the software testing life cycle.
  • The Quality Assurance team’s responsibility is to lay out processes, set standards, and develop checklists, which must be followed throughout SDLC. Quality control is, in turn, the process of verifying that the end results meet functional requirements. This is usually done during the testing phase.
  • Duration is also one of the differences. Quality Assurance is a long process that starts at an early stage of SDLC, while Quality Control is a final checkpoint.


Here is a quick summary of the difference between QA and QC in Software Testing:


Quality Assurance Quality Control
Place in SDLC hierarchy A subset of SDLC A subset of QA
Orientation Process-oriented Product-oriented
Focus Quality evaluation and meeting requirements Testing the finished product, identifying and eliminating defects
Purpose To ensure smooth compliant processes to achieve the necessary quality standards To identify product flaws and confirm its quality
Activity type Preventive Corrective
Time of application Throughout the development process Performed after QA activity is completed (before its release)



Difference Between Quality Assurance, Quality Control and Software Testing: Quick Summary


Alright, let’s summarize  the difference between Quality Assurance, Quality Control and Software Testing. Quality Assurance ensures the correctness and predictability of the development process, while Quality Control assumes control over compliance with requirements. Testing, in turn, provides the collection of statistical data and its reflection  in the documents created as a part of the QC process.


To make the picture completely clear, here is a simple analogy with a watch (be the Rolex, remember?):


  • through testing, we can determine if all the parts and the watch as a whole function as expected. Is it made of the right materials, using the right techniques and tools, or not? Thus, in this case we are talking about a finished product.
  • QA’s job is to ensure that all stages of the design of our watch meet certain quality standards, from planning to the assembly of the finished piece. Thus, attention is paid to the quality of the object before it is actually produced.


Take a look at the table below for a concise but accurate summary of the differences between QA, QC and testing:


Quality Assurance Quality Control Software Testing
A complex of measures which encompasses all technological aspects at all stages of SDLC to ensure the necessary quality of a product The process of monitoring the compliance of the developed system with the requirements The process which is directly responsible for compiling and passing test cases, finding and eliminating defects.
A subset of SDLC A subset of QA A subset of QC
Preventive Corrective Corrective
Process-oriented Product-oriented Product-oriented
Focuses more on processes and tools than on testing a system itself Focuses on testing using approved processes and tools Focuses on test execution per se
Is about managing the quality Concerns quality verification Concerns the improvement of the quality
Defines standards and lays the foundation for complying with user requirements Makes sure the standards are followed Ensures the identification of the bugs/glitches in a product



Does Quality Assurance Remove Need for Quality Control?


Although Quality Assurance and Quality Control have a common mission, they are not interchangeable but rather complimentary. You may wonder, given that QA is preventive in nature and intended to predict any possible pitfalls, why would you need QC? The answer is simple: Quality Assurance does not guarantee an impeccable final product. The role of Quality Assurance is to establish solid processes and make sure they are followed. Quality Control exists to ensure that all of these specific processes, standards, and policies were followed so that a project meets the expectations of end users.


The quality of an end product is still a responsibility of the whole team: developers, designers, and testers as well as managers etc While QA focuses on operations, the actual quality of the deliverables still needs to be double-checked through QC.


At JoinSoft, we make sure you offer clients high-quality products. Click on the button to learn more about our Quality Assurance and testing services.



Difference Between a QA Analyst and Software Tester


Let’s now talk about the difference between a QA Analyst and a Software Tester in terms of roles and responsibilities. These are a few facets worth mentioning:


1.Education requirements. Usually employers prefer QA analysts to have a general science or engineering degree. As for software testers, companies require them to have an associate degree in electronic technology or a related field; however, software testing technician positions are sometimes referred to as entry-level software engineering jobs, which is why some employers offer internships and summer jobs in the field of Software Testing to students pursuing a bachelor’s degree in computer science.


2. Compensation. QA engineers and QA analysts are both high-paid positions compared to other careers. According to Glassdoor, an entry-level salary of a QA analyst in the US in 2021 is $47,000 reaching $68,000 on average per year compared to a Software Tester’s $46,000 and $66,500 accordingly.


3.Necessary skills. Here are the skills that a successful QA analyst and software tester should possess:


QA Analyst Software Tester
  • Understanding of the life cycle and stages of software development;
  • Ability to read programming codes;
  • Ability to master new technologies in the field and knowledge of relevant tools for conducting manual and automatic testing;
  • Knowledge of bug-tracking systems such as Jira or YouTrack, for example;
  • Ability to work with the HTTP protocol and its server response codes;
  • Ability to work with the DOM programming interface;
  • Understanding of object-oriented programming (OOP);
  • Knowledge of HTML and JSON data;
  • Ability to work with cookie data & session;
  • Knowledge of SQL;
  • Ability to maintain test documentation;
  • Understanding of Agile, SCRUM, Lean methods;
  • Knowledge and understanding of the CI&CD system: GitLab, Docker, Kubernetes programs or their analogs;
  • Understanding of Microservice Architecture, HighLoad;
  • Ability to work with tools and methods of BigData processing;
  • Mastery of testing software solutions based on the technology stack (GoLang and / or php (symfony), PostgreSQL and / or Clickhouse);
  • The skill of creating test plans and test cases.
  • Ability to create and document automated and manual test plans and procedures, run tests, analyze results, report test problems, and document bugs;
  • Ability to perform software testing at all stages of the software life cycle: design-development-testing-release-maintenance;
  • Understanding various development techniques such as Agile and Scrum as well as software testing frameworks and environments;
  • Deep knowledge of several testing tools;
  • Fluency in UNIX, Linux and/or Windows, as well as scripting and command line tools;
  • Ability to multitask;
  • Being an excellent communicator on development, operations, product management and customer issues;
  • Possessing knowledge of various programming languages such as Java, JavaScript, C # or C ++, SQL, Python, PHP and Ruby on Rails.


4.Responsibilities. On the one hand, a QA analyst’s role is to apply principles and methods of software quality assurance throughout software development lifecycle.

Among the responsibilities of a QA analyst we can name the following:

  • Participating in QMS review meetings;
  • Developing the QMS documents;
  • Undertaking internal quality audits;
  • Planning and conducting quality audits of subcontractors (if applicable);
  • Maintaining and updating training and audit databases to provide reports and indicators for discussion at QMS management review meetings;
  • Identification of problems or deficiencies in products and QMS;
  • Resolving QMS implementation problems;
  • Participating in external quality audits;
  • Tracking all process-related metrics in terms of schedule, scope of work, and defects.


On the other hand, a Software Tester is a technician who conducts software tests prior to their release to ensure quality, design integrity, and proper functionality of a product. They use rigorous testing techniques, including extensive end-user simulations, to identify software glitches that are afterwards rectified by developers.

A simple example of QA vs software testing: a QA team decides that the quality level of unit tests has to be at least 80%. The Software Testing team’s job now is to reach that goal.


A QA Analyst A Software Tester
  • Ensures a good user experience
  • Monitors a development process and identifies gaps
  • Improves processes
  • Is active throughout the whole SDLC
  • Undertakes software tests
  • Reports bugs
  • Minimizes occurence of critical bugs
  • Works with a finished product but before its release



QA Analyst Vs Quality Control Engineer


The difference between a QA analyst and a QC Engineer in terms of the roles they have during a development process is also substantial. The distinctions include:


1.Education requirements. As we already mentioned, a general science or engineering degree even in Biology or Chemistry is enough to become a QA analyst. Although, things are a bit different for QC engineers. Employers require that Quality Control engineers hold at least a bachelor’s degree in engineering. It is a win-win situation if it focuses on quality engineering or quality control. It would be a plus if a QC engineer had courses and labs covering quality planning and control, reliability engineering, metrology, and experimental design.

The demand for Quality Control engineers is expected to decrease, mainly because more and more companies choose automated inspection methods. Between 2019 and 2029, the number of hired QC specialists is projected to decline by 17%, according to the US Bureau of Labor Statistics.


2.Compensation. According to Glassdoor, the entry-level salary of a QA analyst in the US in 2021 is $47,000 reaching $68,000 on average per year compared to a Software Tester’s $46,000 and $69,000 accordingly.


3.Necessary skills. The skillset of a QC engineer is quite similar to the one of a software tester, since Software Testing comes as a subset of Quality Control.


4.Responsibilities. While a QA analyst collects information about the product and devises ways the development process can be improved, comes up with solutions on what methods to use, QC engineers, depending on their field and skillset, have the following duties:


  • Communicate with clients and analyze their needs;
  • Look for bugs in the product and log them into the system;
  • Investigate software requirements and identify discrepancies;
  • Interact with developers, technical support, other process participants and help them;
  • Automize tests;
  • Develop test documentation and create reports.


A QA Analyst… A Quality Control Engineer…
  • Ensures a good user experience
  • Monitors a development process and identifies gaps
  • Improves processes
  • Is active throughout the whole SDLC
  • Looks for glitches in the software and reports them
  • Engages in test automation
  • Makes sure the quality of a finished product meets the defined standards
  • Works with a finished product but before its release



Theory is good, but practice is better. Thus, to make sure you processed the new information, let’s explore the essential difference between QA, QC, and testing by referencing to a more practical paradigm.



Examples for QA


QA analysts have to understand the system as a whole. Often, they are the only people in a company who are able to do this.

See, the more complex a product becomes, the more time-consuming it is to measure and sustain the overall product quality. The time to perform a complete product regression testing grows exponentially with the number of interconnected modules. Some changes in one part of a system can unpredictably affect the behavior of others.


Understanding the whole product complexity requires time, knowledge, attention and experience. QA’s part is to develop subject matter expertise. It is essential since a full check of all possible scenarios is too time consuming and sometimes simply impossible. This means that a QA’s  work cannot be limited to execution of the test plan.


In case there is an issue with an interaction of different modules, only a QA can notice them and save  time on the implementation of unsuccessful solutions in advance.

For example, the quality of a product appeared to be poor. A QA analyst starts sorting it out to understand the reason. After talking with the team, he realizes that the project lacks proper planning.


New features are taken from backlog to development without preliminary assessment of labor costs, and the team has to try hard to meet the deadline. As a result, in a hurry developers make many mistakes, and testers do not have time to check all test scripts.

The solution is to provide an estimate of the workload induced by the introduction of new features and planning based on that workload.

In addition, QA specialists are often the “knowledge hub” and a repository of lessons learned in terms of past projects, which ensures the integrity of understanding of a product.



Examples for QC


Software Quality Control is used to answer the most critical question: is software usable? In addition, does the product meet the quality criteria?

Imagine a shoes factory. It received an order to produce 100 black shoes. The task of QC is to make sure that all these 100 shoes are black. Not dark-grey or any other color but black. They have to ensure each pair has no stains, scratches or other defects.

When deciding whether a product is ready for launch (release), a QC specialist has test results – the number and priority of errors. If there are high-priority defects, then QC will not miss such a product and will insist on fixing these bugs.



Examples for Software Testing


Testing includes implementing test cases, detecting, and registering glitches.

In terms of the general testing procedure, a Software Tester:

  1. Receives the product and requirements;
  2. Writes test cases or receives prepared ones;
  3. Checks test cases and registers defects if there are any.

There is manual and automated software testing. Hence, manual testers check applications manually, while automated testers work with software.

The manual tester simulates actions of a user. A specialist makes sure that the program works as expected in different interaction scenarios.

Automated testing involves testing applications with software. Furthermore, automated testing is super handy when tests are repeated multiple times or when testing involves large amounts of data.



QA and Software Testing by Joinsoft


Joinsoft’s mission is to provide the best quality products to our clients. Therefore, we did our best to assemble a team of QA analysts, QC engineers and Software Testers that share the company’s vision of quality and devotion to our mission. Our team can promise you to:


  • Take advantage of the latest technologies in software testing and quality assurance.
  • Use an individual approach based on Agile methodologies and metrics for efficient software testing.
  • Make sure to run the most suitable types of testing based on the specificity of each product.
  • Always keep in touch with our clients involving them into every stage of the workflow. be completely transparent with our clients so that they know how the process is progressing.


At Joinsoft we are result-oriented; our clients’ success is our key metric. Perhaps, we will contribute to yours soon? Follow the links to learn more about our:



Difference Between Quality Assurance, Quality Control and Software Testing: Final Thoughts


Congratulations on reaching the end of this “quality” journey! We hope you’ve learnt what Quality Assurance, Quality Control and Software Testing are. What’s more important, you now know the differences between them and will not be one of those people looking for a “QA tester”.

Despite the fact that these share a common goal of releasing high-end software that will satisfy the needs of users, none of them should be neglected.



Rate this article!

Average rating 3.9 / 5. 14

No votes so far! Be the first to rate this post.

You may also be interested in
Off-The-Shelf or Custom Software Website
Taking the right decision whether to use premade or custom enterprise e-commerce software is not easy since both over specific advantages and disadvantages. A popular delusion is that the global software market is domina...
by Kirill K. & JoinSoft Team
26 Aug 2020
e-commerce website development process
People love to buy. Modern people love to buy quickly. In the dynamic world that we live in today, e-commerce combines ease of purchasing, speed, variety of products and product categories...
by Valeriia P. & JoinSoft Team
08 Jul 2021
With current consumer traffic it is nearly impossible to process payments manually. The user would rather leave the site than wait for the order. That is why online merchants are increasingly using a payment gateway. It...
by Anna B.
21 Aug 2020