After finishing the Master in Educational Sciences and the Research Master in Behavioral and Social Sciences at the University of Groningen, Trynke Keuning started her PhD trajectory at the University of Twente. In this PhD trajectory, together with Marieke van Geel, she studied the effects of the Focus intervention: a two-year professional development trajectory in Data-Based Decision Making for primary school teams, in which she was particularly interested in collaboration patterns and measuring teacher quality. In 2016 she completed this PhD trajectory. Since then she has been working for Maastricht University and the University of Twente as a Postdoc together with Marieke as coordinator and researcher of the MATCH project. In the MATCH project, Trynke researches by means of a cognitive task analysis what differentiation in primary school mathematics education entails. In doing so, they try to answer questions such as: "what exactly is differentiating?" And "what characterizes a good differentiating teacher". The task analysis will be the basis for the development of a training trajectory, that will be implemented and evaluated.