Quality Assurance Vs Quality Control (QA Vs QC)

Fahad Usmani, PMP

March 23, 2026

Quality assurance and quality control are key concepts you must understand, especially for the PMP exam. These two processes may sound similar, but they serve different purposes in delivering high-quality results. Quality assurance focuses on improving processes to prevent defects, while quality control checks deliverables to find and fix issues.

When you clearly understand quality assurance vs quality control, you can manage projects with confidence and avoid costly mistakes.

In this blog post, you will learn the difference between QA and QC, see simple examples, and understand how both work together to improve project outcomes and meet stakeholder expectations every time.

What is Quality Assurance?

Quality assurance is part of quality management that provides confidence that project requirements will be met. This confidence has two sides: internal (giving managers and teams confidence in their process) and external (ensuring customers and regulators trust the product). Rather than inspecting finished deliverables, QA focuses on designing and executing plans to prevent problems.

Key QA activities include:

Defining requirements and expectations. Project teams work with stakeholders to agree on what quality means. Clear acceptance criteria set the stage for success.
Planning how to meet those requirements. A quality management plan outlines roles, standards, and procedures. It includes training, audits, and process reviews.
Improving processes through feedback. QA teams collect data from QC activities and adjust methods to prevent future errors.
Auditing and documenting. Independent audits compare actual practices with planned standards. Documentation ensures lessons learned are captured for the next project.

Because QA happens throughout the project, it is proactive and preventive. Teams often use checklists, process audits, and training sessions to promote consistent practices.

What is Quality Control?

Quality control is part of quality management that ensures quality requirements are met. While QA looks at the process, QC inspects products or services to ensure they meet agreed standards. QC is reactive but still continuous: you check deliverables at regular intervals and after major milestones.

Key QC activities include:

Measuring outputs. Team members examine ongoing work and finished products to detect errors or non-conformities. Tools like inspections, sampling, and testing are common.
Identifying defects. When a deliverable doesn’t meet the standard, QC flags it for correction. This might involve rejecting defective items, reworking software code, or revising documents.
Verifying final products. Before handing over deliverables to the client, QC ensures they match all requirements and specifications.
Providing feedback for improvement. Findings from QC feed back into QA so the process can be refined.

QC is reactive because it addresses work that has already been performed, but it helps catch problems early, before they reach the customer. Inspections, tests, peer reviews, and statistical sampling are tools used in QC.

Quality Assurance Vs Quality Control: Key Differences Between QA and QC

QA and QC work together, yet their objectives and timing differ. The table below summarizes the main contrasts and can help you remember which is which.

In plain language:

Objective: QA’s goal is to prevent defects by improving how work is done. QC aims to detect defects in finished or in-progress deliverables.
Focus: QA looks at the processes used to create deliverables. QC examines the products themselves.
Timing: QA activities run throughout the project; QC checks happen after work has been performed.
Nature: QA is a management function that builds confidence; QC is a verification function that confirms products meet requirements.

Both QA and QC feed information back to each other. QC findings inform process improvements, while QA adjustments lead to better QC results. Together, they create a virtuous cycle of continuous improvement.

Why QA and QC Matter: The Cost of Poor Quality

Modern projects operate in complex environments. Recent industry surveys show that many quality professionals are stretched thin: 60 percent perform no QC activities, 52 percent spend less than a quarter of their time on QA, and 73 percent still rely on manual documentation. The consequences are costly. In regulated industries, an average FDA inspection observation costs about US $250,000 to remediate, and product recalls can cost US $10 million.

Not balancing QA and QC also affects productivity and morale. Organizations with poor-quality practices experience 40 percent longer development cycles, three times as many inspections, 60 percent more customer complaints, and 25 percent lower employee satisfaction. These numbers underscore why you should plan for both prevention and inspection.

On the positive side, robust QA and QC frameworks save time and money. A quality management system (QMS) creates a culture of excellence and drives continuous improvement. When quality is built into every stage of a project, customers return because they trust your work. ISO notes that a well-integrated QMS improves communication, reduces waste, and promotes collaboration. In other words, quality is not an overhead cost but an investment in customer satisfaction and long-term success.

Examples Across Industries

Quality practices vary by industry, but the QA/QC distinction remains the same. The following infographic highlights how QA and QC apply in three different fields.

Software development. QA teams define coding standards, conduct peer reviews, and use automated tools to keep code consistent. QC teams run unit tests, integration tests, and user acceptance tests to find bugs before release.

Manufacturing. QA includes sourcing qualified suppliers, documenting assembly procedures, and training workers. QC checks the first items off the assembly line, measures parts against specifications, and rejects defective products.

Healthcare. QA involves establishing protocols, training clinicians, and ensuring adherence to guidelines. QC involves testing lab results, reviewing patient records, and monitoring equipment calibration.

Across industries, QA builds solid foundations and QC guards the final product. Think of QA as teaching your team to cook with clean tools and QC as tasting the meal before serving.

QA and QC on the PMP Exam

The PMP exam tests your understanding of both Manage Quality (QA) and Control Quality (QC) processes.

Here are key points to remember:

Process group placement. Manage Quality falls under the Executing process group. It includes designing tests, performing audits, and implementing improvements. Control Quality is part of the Monitoring and Controlling process group and involves inspections, peer reviews, and acceptance decisions.
Tools and techniques. QA tools include quality audits, checklists, process analysis, and design for X (DfX). QC tools include inspection, statistical sampling, testing/product evaluations, and cause-and-effect diagrams.
Inputs and outputs. Manage Quality uses the quality management plan, project documents, organizational process assets, and approved change requests. It outputs quality reports, test and evaluation documents, and change requests. Control Quality uses the quality metrics and results of Manage Quality activities, verified deliverables, and work performance information.
Exam tip. When a question asks about preventing defects, choose Manage Quality. When it mentions verifying deliverables or accepting work, choose Control Quality.

Understanding where each process fits and what it achieves will help you answer PMP questions confidently.

FAQs

Q1. What is the main difference between QA and QC?

QA prevents defects by improving processes, while QC detects defects in outputs. Think of QA as planning and QC as checking.

Q2. Do I need both QA and QC on a project?

Yes. Prevention and detection work together. A good process reduces defects, and checks catch the ones that slip through.

Q3. Is quality assurance the same as testing?

No. Testing is a QC activity. QA includes planning, training, and audits to ensure processes produce good results.

Q4. How can I remember the difference for the PMP exam?

A simple memory aid is “A for avoid defects, C for catch defects.” If the question concerns improving processes, choose QA; if it concerns verifying deliverables, choose QC.

Summary

Understanding quality assurance and quality control is essential for project success and PMP exam preparation. Quality assurance improves processes to prevent defects, while quality control checks deliverables to ensure they meet requirements. When you apply quality assurance vs quality control correctly, you reduce errors, save costs, and improve customer satisfaction. Both work together to build strong, reliable outcomes. As you prepare for the PMP exam, focus on understanding their roles, timing, and differences so you can answer questions with confidence and manage projects more effectively.

This concept is important for the PMP exam.

Fahad Usmani, PMP

I am Mohammad Fahad Usmani, B.E. PMP, PMI-RMP. I have been blogging on project management topics since 2011. To date, thousands of professionals have passed the PMP exam using my resources.

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