Group of supervision services is the largest specialized section of Ray-Ab Co. including about 350⁺ resident engineers in the 25 provinces of Iran, that provide site supervision services in the executive projects.

The technical and expert support of this group are experts and graduates with PhD, MS and Bs degrees in related fields. The specialized sections of this group are:

1. Site supervision and technical office in sites
2. Surveying and GIS
3. HSE

This group continuously connects to the headquarter to coordinate site issues.