This document describes three system design tools: the stakeholder system map, interaction table, and storyboard. The stakeholder system map visually maps the stakeholders involved in a system and the flows between them, such as material, information, and financial flows. The interaction table and storyboard are used to design and visualize the functioning of a system through a sequence of images and text describing interactions between stakeholders over time. These tools can be used at different stages of the design process to analyze existing systems, develop new system concepts, and further refine system details. Templates and libraries to support using these tools can be found on the LENS website.