Prevention vs Inspection
Prevention keeps errors out of the process by designing quality into the work, while inspection keeps errors out of the hands of the customer by examining deliverables after they are produced.
Explanation
PMI strongly favors prevention over inspection as a quality management philosophy. Prevention means designing processes and deliverables so that defects do not occur in the first place. This includes activities like training, process documentation, proper planning, and using appropriate tools and techniques. The cost of prevention is typically much lower than the cost of fixing defects found during inspection.\n\nInspection involves examining, measuring, or testing deliverables to determine whether they conform to requirements. While inspection is necessary and important, it is inherently reactive. By the time a defect is found through inspection, resources have already been spent creating the defective item. Inspection catches defects but does not prevent them.\n\nThe PMI principle is clear: the cost of preventing mistakes is generally much less than the cost of correcting them when found by inspection. This does not mean inspection is unnecessary. Rather, a robust quality approach uses prevention as the primary strategy and inspection as a safety net.
Key Points
- •PMI favors prevention over inspection
- •Prevention is proactive; inspection is reactive
- •Prevention costs less than correction after inspection
- •Both prevention and inspection are necessary; prevention should be primary
Exam Tip
Whenever the exam asks about PMI's quality philosophy, the answer emphasizes prevention over inspection. Quality should be planned and designed in, not inspected in.
Frequently Asked Questions
Related Topics
Cost of Quality (COQ)
Cost of Quality (COQ) is the total cost incurred over the life of a product by investing in preventing nonconformance, appraising deliverables for conformance, and dealing with failure when requirements are not met.
Cost of Conformance
Cost of conformance is the money spent during the project to avoid failures, including prevention costs (building a quality product) and appraisal costs (assessing the quality).
Cost of Nonconformance
Cost of nonconformance is the money spent during and after the project because of failures, including internal failure costs (defects found by the project) and external failure costs (defects found by the customer).
Quality vs Grade
Quality is the degree to which a set of inherent characteristics fulfills requirements, while grade is a category assigned to deliverables having the same functional use but different technical characteristics.
Manage Quality
Manage Quality is the process of translating the quality management plan into executable quality activities that incorporate the organization's quality policies into the project.
Most-studied PMP concepts
High-yield topics our learners drill most before exam day.
Burndown Chart
A Burndown Chart is a graphical representation of work remaining versus time in a Sprint or release, showing whether the team is on track to complete the planned work.
Resource Leveling
Resource leveling is a resource optimization technique in which adjustments are made to the project schedule to keep resource usage at or below a defined limit, often resulting in a longer project duration.
Risk Register
The risk register is a project document that records the details of individual project risks, including their identification, analysis results, response plans, and current status.
Stakeholder Mapping
Stakeholder mapping is the visual representation of stakeholder relationships, influence, interest, or other attributes using grids, matrices, or diagrams to support analysis and engagement planning.
Relative Estimation
Relative Estimation is an agile technique where work items are sized in comparison to each other rather than in absolute units like hours or days, providing faster and more accurate estimates.
Cost Performance Index (CPI)
Cost Performance Index (CPI) is an EVM efficiency metric that measures cost performance as the ratio of earned value to actual cost: CPI = EV / AC.
Schedule Performance Index (SPI)
Schedule Performance Index (SPI) is an EVM efficiency metric that measures schedule performance as the ratio of earned value to planned value: SPI = EV / PV.
Earned Value Management (EVM)
Earned Value Management (EVM) is a methodology that integrates scope, schedule, and cost data to assess project performance and progress objectively.
Power/Influence Grid
The power/influence grid is a stakeholder classification model that groups stakeholders based on their level of authority (power) and their active involvement or ability to affect the project (influence).
Part of
Quality Management
Test your knowledge
Practice scenario-based questions on this topic with detailed explanations.