Controlling quality ensures that the project deliverables line up with the quality standards established in the project quality plan by using appropriate tools and techniques such as testing, inspection, and control in order to adhere to customer requirements.
The pmbok quality control process focuses on product quality as well as project quality because much of the quality improvement and quality control work that is carried out on project emanates from the many tools and techniques that are tailored to meet the project needs.
A very close relationship exists between quality control and scope verification.
Perform quality control is all about comparing deliverables against the quality plan and quality metrics so that the deliverables are correct and meet the requirements. Once this has been done the validated deliverables go through the verify scope process for customer acceptance.
While controlling quality, the project manager checks that approved change requests were implemented has approved, and this is one of the aspects of project scope of that is analysed and controlled.
When planning for quality the techniques are used to plan measurements, tolerances, and procedures. However, it is within this process that those measurements, tolerances, and procedures are applied. The results from applying the measurements are inputs to the perform quality assurance process.
This is the process of monitoring and recording results of executing the quality activities to assess performance and recommended necessary changes. Be clear that we are talking about results here, not deliverables, so keep in mind that a large amounts of quality control is associated with results.
However another aspect of perform quality control is assessing whether the project is performing well in addition to whether the processes are working correctly.
Because this is the quality process, you must remember that prevention is preferred over inspection, because preventing a problem or defect in the design process is far better than finding it after the deliverable is complete and then having to repair it.
The quality management plan provides direction for the perform quality control process and typically provides the following information:
The quality management plan will also define the roles and responsibilities for quality control and identify the organisational process assets such as any policies or procedures that must be followed.
Quality metrics are those specific measurements that must be met in order for the results to meet the quality requirements.
The quality checklists hope to make sure that all the proper steps are being followed so that you comply with policies, regulations, or processes.
The information in the quality plan, metrics, and checklists is used with the work performance measurements along with the deliverables.
The work performance measurements come from the control scope, control schedule, and control cost processes.
The work performance measurements are used to determine whether or not the project performance is acceptable, and the deliverables are used to determine whether the product performance is acceptable.
The perform quality control process is where change requests are validated.
The perform integrated change control process uses the change request, the change log, analysis, decisions, document updates, communication, and implementation.
Verification takes place in this process, and the approved change requests are an input to perform quality control. The implementation of those change requests are reviewed, if the change requests are implemented as directed, they are validated.
When validating the change in the perform quality control process, it is important to ensure that the work breakdown structure, schedule, budget, resource requirements, and all other documentation are updated and consistently reflect the approved change.
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