The Life Skills Survey Tool (LiSST) measures four life skills domains—positive mindset, higher order thinking skills, interpersonal skills and community mindset (according to IYF’s Life Skills Framework) using a 49-question self-administered survey. This document presents the development of the scale along with its psychometric properties. The LiSST is a promising tool to measure changes in youth participants’ life skills in a range of contexts to inform program improvement and assess impact.