Business continuity becomes an important feature for business these days. It is difficult to accept unplanned downtime due to the unavailability of the service, which mostly is unavoidable. The unavailable of the service is the situation such as service failure, unplanned downtime, etc. When such situation occurs, the system will need to look for some solution that will allow the system to continue. A simple but effective solution is to provide at least one alternative path of services that performs similar functions to the usual services which become unavailable. Therefore, switching between service paths is crucial in any reliable system. Service quality of a system or task can be determined with various factors. One of the most common factors is service coupling. This study will analyse the changes in couplings upon service switching, which in turn reflect the overall quality of the system.