A clear mental model is a critical tool for planning, briefing and (hopefully not!) troubleshooting … especially where managing change may impact pressure control equipment configuration or function. And, of course, tools that enable you to share that mental model with crew members and stakeholders are a valuable resource for ensuring people are aware and prepared for the planned operation. Pre-prepared drawings for rig-up and fluid flow are key part of the operation document package … but what tools do you have for planning and briefing for variations to the intended sequence of events. Simple, effective and easy to use visualisation tools are economic and versatile … especially when managing change and the resulting stress and consequences are substantially increased. Consider what tools you would use … and let me know if you have something better!