Premium Resources

Perform Quality Control

Perform Quality Control focuses on:

  • Examination of actual deliverables of the project

  • Ensure deliverables are correct and they meet the planned level of quality

Perform Quality Control is a process of ensuring a certain level of quality in a deliverable, whether it is a product or a service. Control means measure, and that is a major function of Perform Quality Control process. It measures products or services to determine whether they meet the quality standards. In large companies, a quality control department may complete much of quality control work and report the findings to the project manager. The project manager must be able to read and understand the quality measurement reports. Quality Control occurs throughout the life of the project. A few important terms related to quality control are described:

Mutual Exclusivity

Two events are said to be mutually exclusive if they cannot both occur in a single trial.


Probability refers to the likelihood that something will occur. It is expressed as a decimal or a fraction, on a scale of zero to one.

Normal Distribution

A normal distribution is a shape of a bell curve and is the most common probability density function. It is used to measure variations.

Statistical Independence

Statistical independence means the probability of one event occurring does not affect the probability of another event occurring.

Standard Deviation (OR Sigma)

A measure of range is its standard deviation. This concept is also sometimes stated as a measure of how far you are from the mean

Seven Basic Tools Of Quality

The following tools are known as seven basic tools of quality:

  1. Cause and effect diagram

  2. Flowchart

  3. Histogram

  4. Pareto Chart

  5. Run Chart

  6. Scatter Diagram

  7. Control Chart

Cause And Effect Diagram (FISHBONE Diagram Or Ishikawa Diagram)

The PMP exam has used the following types of phrasing to describe cause and effect diagram:

  • A creative way to look at the causes of a problem

  • Helps stimulate thinking, organizes thoughts and generate discussion

  • Can be used to explore the factors that will result in a desired future discussion


A histogram displays data in the form of bars or columns. This tool shows what problems are worth dealing with. A typical histogram presents data in no particular order.

Pareto Chart (PARETO Diagram)

A Pareto chart is a type of histogram, but it arranges the results from most frequent to least frequent to help identify which root causes are resulting in most problems. It is based on 80/20 rule which states that 80% of the problems are due to 20% of the causes.

Pareto Charts:

  • Help focus attention on the most critical issues

  • Prioritize potential causes of the problem

  • Separate the critical few from the trivial many

Run Chart

A run chart allows the project manager to look at history to see if there is pattern of variation. It is a useful tool for controlling quality.

Scatter Diagram

A scatter plot is often employed to identify potential associations between two variables, where one may be considered to be an explanatory variable (such as years of education) and another may be considered a response variable (such as annual income)

Outputs Of Perform Quality Control

The outputs of Perform Quality Control process are:

  • Measurements

  • Validated changes

  • Updates to project management plan and project documents

  • Change requests

  • Lessons learned

  • Validated deliverables

Related Topics