Standardise–Do–Check–Act (SDCA)

Introduction: SDCA

SDCA stands for Standardise–Do–Check–Act, a continuous improvement cycle that focuses on stabilising and maintaining consistent processes. While the PDCA (Plan–Do–Check–Act) cycle is designed for improvement and innovation, SDCA ensures that existing standards are applied and sustained, creating a stable foundation for future progress.

Background

In Lean and quality management, standardisation is recognised as the cornerstone of improvement. Without clear, documented standards, processes become inconsistent, leading to variation and waste. The SDCA cycle was developed to reinforce process stability by ensuring that the best-known methods are consistently followed before applying PDCA for further optimisation. This approach supports a culture of discipline, reliability, and accountability in daily operations.

Key Elements / Features

The SDCA cycle consists of four structured steps:

• Standardise: Define and document the most effective way to perform a task. Create standard operating procedures, checklists, and visual controls to make the method clear.
• Do: Carry out the task according to the standard, ensuring all team members apply the same method consistently.
• Check: Monitor performance against the standard, identify deviations, and evaluate whether the process is being followed correctly.
• Act: Take corrective action to address any deviations and improve the standard if a better approach is identified. The new method then becomes the updated standard.

Applications / Examples

SDCA is applied across many sectors:

• Manufacturing: Standardising machine setup or changeover procedures to reduce variation and improve uptime.
• Healthcare: Ensuring consistent clinical procedures to maintain patient safety and compliance.
• Office and Service Environments: Creating standard workflows for tasks such as data entry or client onboarding to improve efficiency and accuracy.

Relevance / Impact

SDCA reinforces process discipline and prevents regression to inefficient habits. It ensures that improvements are sustained and that processes remain reliable over time. By embedding standardisation into daily work, SDCA prepares organisations for the next stage of improvement through PDCA. Companies that adopt SDCA benefit from higher quality, better consistency, and a stronger culture of continuous improvement.

See also

• PDCA (Plan–Do–Check–Act)
• PDSA (Plan–Do–Study–Act)
• Standard Work
• Total Quality Management (TQM)