It is well-established that population health is influenced by a multitude of factors, many of which lie outside the scope of the health sector. In the public health literature it is often assumed that intersectoral engagement with nonhealth sectors will be instrumental in addressing these social determinants of health. Due to the expected desirable outcomes in population health, several countries have introduced Health in All Policies (HiAP). However, whether this systematic, top-down approach to whole-of-government action (which HiAP entails) is efficient in changing government policies remains unclear. A systematic evaluation of HiAP is therefore much needed