When Poka Yoke a, if you are executing a six sigma project Poka Yoke can be used in the improved phase before launching a pilot or in the control phase before rolling out the actions on the shop floor. It is important that you implement Poka Yoke in your business process before implementing any process improvement action. Implementing Poka Yoke is a low hanging fruit. In other words, as you map your business process in the Define or measure phase, and identify that Poka Yoke can be simply implemented in the business process without much of an effort. You may also use this tool in these phases. Lastly, Poka Yoke is a standalone tool.
It doesn't require a projectized environment to get implemented. If you observe there is a gap in your business process and have the necessary know how of utilizing this tool. By all means. Please use it and gain the benefit of an error free process.