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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 medical device manufacturer applies PDCA to reduce their CAPA closure time. Plan: analyse current state (average 42 days), set target (21 days), identify root causes of delays (unclear ownership 35%, waiting for parts 25%, investigation complexity 20%, resource constraints 20%). Do: implement changes — assign single CAPA owners, create standard investigation templates in Q-Hub, add 7-day and 14-day milestone checkpoints with automatic escalation. Check: monitor for 3 months — average closure time drops to 19 days, on-time closure rate improves from 65% to 91%. Act: standardise the new process as the default CAPA workflow in Q-Hub, share learnings 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

Want to see how Q-Hub handles PDCA Cycle in practice? Book a demo or see pricing.

Related QHSE Terms

  • AS9100 — The aerospace quality management standard, based on ISO 9001 with additional requirements for aviati
  • Audit — A systematic, independent examination of processes, products, or systems to verify compliance with d
  • Bow-Tie Analysis — A visual risk assessment method that maps the causes of an event, the event itself, its consequences
  • CAPA — Corrective and Preventive Action — a systematic approach to investigating root causes of non-conform
  • COSHH — Control of Substances Hazardous to Health — UK regulations requiring employers to control exposure t
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