A worksheet that introduces** iterative design**. Can be used as a cover lesson, a homework or as part of a Resistant Materials course. Designed to fit a one-hour lesson and it’s **peer assessed **at the end. Aimed at KS3 or KS4 and useful for students embarking on** non-exam assessment** projects in GCSE Product Design and Resistant Materials. The worksheet focuses on primary stakeholder feedback and user centered design (UCD). Students just need a pencil, ruler and rubber and someone to offer feedback.