Riving factors for a telecomms operator to move from Single vendor to multi-vendor environment

This a project proposalfor MBA in operation Management. Am seeking to find out whether there is a change of vendors by a local telecomms service provider as a result of change in technology or as change in service provision for the vendors. Looking at the data collected, the telecomms vendor had initially been using single vendors for a specific technology applied but now there is an increase in using multi-vendors for any single technology. In this case, the alternative hypothesis would be there is a shift in a telecomms operator from single vendor to multi-vendor due to poor service delivery under one vendor per technology. The null hypothesis would be the shift from single vendor to multi-vendor is not due to poor service delivery under multi-vendor.