Policy is not just in 8.3 Governance - public health policy should be coded to 3.1 Primary prevention , research relating to policy banning smoking in public places would be coded as 3.2 Environmental prevention.

There are a number of research areas that are repeated in different parts of the Research Activity Codes. Classification of research is context dependent and the coding guidance is to identify the appropriate main code group first prior to assigning a code within it.