The PDCA (Plan-Do-Check-Act) cycle is a continuous quality improvement model used to carry out change. It involves planning a change, implementing it on a small scale, checking the results, and acting on what is learned by either adopting or abandoning the change. The goal is continuous improvement through continual cycles of change. The PDCA cycle allows testing changes in a structured way and building knowledge through each repetition of the cycle. It is designed to be used dynamically, with learning from one cycle informing the next.