In 2015 the team behind Certified Professional completed the development of the Competency Framework for Accelerating Sustainable Transitions. To validate this certification offer and its relevance to the transition community they decided to use, an internal test phase was conducted. The Climate-KIC community of more than 1000 alumni of the Pioneers into Practice programme provided a representative frame of reference. 75 candidates from 15 nations in Europe and beyond joined. Assessors from Austria, Germany, Hungary, and the UK helped verify the assessment methods and scoring framework. Having implemented the learnings from this initial roadtest, the reviewed framework was piloted in 2016.