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QHSE Glossary

PDCA Cycle

Plan-Do-Check-Act — a four-stage continuous improvement cycle used in quality and process management.

PDCA Cycle

PDCA Cycle (Plan-Do-Check-Act Methodology) is a critical concept in quality, health, safety, and environmental management.

What Is PDCA Cycle?

The PDCA Cycle (Plan-Do-Check-Act), also known as the Deming Cycle or Shewhart Cycle, is a four-stage iterative management methodology for the continuous improvement of processes and products. Plan: establish objectives, identify processes, determine resources. Do: implement the plan on a small scale. Check: monitor and measure results against objectives. Act: take action to standardise improvements or restart the cycle. The PDCA cycle is embedded in every ISO management system standard through the Annex SL High-Level Structure. Walter Shewhart originally proposed the concept in the 1930s; W. Edwards Deming popularised it in Japan in the 1950s, contributing to the Japanese post-war economic miracle.

PDCA Cycle Requirements Under UK Law

ISO 9001:2015 is explicitly structured around the PDCA cycle: Clauses 4-6 (Plan), Clause 7-8 (Do), Clause 9 (Check), Clause 10 (Act). The same structure applies to ISO 14001 and ISO 45001. HSE's guidance document HSG65 (Managing for Health and Safety) uses the Plan-Do-Check-Act framework. EFQM Excellence Model incorporates PDCA thinking. In lean manufacturing, PDCA is applied at every level — from shopfloor problem-solving (A3 reports) to strategic deployment (Hoshin Kanri). Toyota's Toyota Production System applies PDCA to every improvement, however small.

Key Components of PDCA Cycle

  • Plan (establish objectives and processes)
  • Do (implement and operate)
  • Check (monitor
  • measure
  • and review)
  • Act (take actions to continually improve)
  • PDSA variant (Plan-Do-Study-Act
  • Deming's preferred version)

PDCA Cycle in Practice

A worked example. A medical device manufacturer applies PDCA to reduce their CAPA closure time. Plan — measure the current state, set a target, and identify the causes of delay: unclear ownership, waiting for parts, investigation complexity, resource constraints. Do — assign a single owner per CAPA, create standard investigation templates, and add milestone checkpoints with automatic escalation. Check — monitor for 3 months against the same measure used in Plan, because a target set on one measure and checked on another proves nothing. Act — standardise whatever worked as the default workflow, and share the learning across other product lines.

How to Manage PDCA Cycle with Q-Hub

Q-Hub provides comprehensive tools for PDCA Cycle management. The Automated Workflows module handles the core requirements, integrated with document control, audit scheduling, training management, and KPI dashboards to ensure your PDCA Cycle processes are audit-ready at all times.

Related Terms

Q-Hub software for PDCA Cycle

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