Make ten steps forward or more for the future career by enrolling at site manager courses online with The College of Contract Management. Site manager courses divide with two options for students, that is the certificate and the diploma. Both of the courses are already qualified with the CIOB, it makes learning with The College of Contract Management a credible place to study. The period of study for the certificate of site manager is 6 months, and for the diploma in site manager is 18 months.