Big bang v/s phased transition approach

Transition Methodology (approach) is the process of taking over the services from an in-house IT or an incumbent service provider. It takes the center stage during the entire course — from the assessment phase to the steady state phase. In addition, transition methodology has a direct bearing on the timelines, resources and risk management ability, and on ensuring zero disruption to the business.

Managed services engagements are performed using one of the two models in transition methodology— Big Bang or the Phased Approach (also referred to as Wave methodology or step-by-step model).