Kaizen is a Japanese term meaning continuous improvement. It refers to incremental improvements made on a continuous basis and involves grassroots workers. Kaizen follows a bottom-up-bottom approach where ideas originate from job level staff and are approved at the policy level. The roadmap for implementing kaizen at a workplace involves observing current processes, developing ideas for improvement, implementing changes, checking results, standardizing successful changes, and continuing the cycle of improvement. Metrics like reduced waste, improved quality, and safety are used to measure the impact of kaizen activities.