There are many approaches which consultants follow. HR Mark follows the Six Sigma method for most of the consolation project I undertake no matter what they are, the method stays the same.
The starting point to define the problem faced by the organization, its impact on the stakeholders, and assess the organizational capabilities to tackle it.
In this stage, a measurement of the current data and information has to be done and benchmarked with the similar organizations
This is the stage which requires you to analyze the cause and effects of the problem. Break it down. Use a fishbone diagram or any causality framework.
Start with a change management program and introduce quick wins
This when a change is anchored and institutionalized within the organization