Q.Explain the different approaches used to bring an ERP system live (Big Bang, phased, and parallel).

There are three common ways to switch an organisation over to a new ERP system, differing in speed and risk.

'Going live' is the point at which an ERP system is put into actual operation. There are three common approaches, differing in speed, cost, and risk:

1. Big Bang approach — the whole ERP system is switched on across all departments at a single point in time. It is the fastest approach and avoids running two systems, but it is the riskiest: if something goes wrong, the entire organisation is affected at once.
2. Phased approach — the system is brought online in stages, one module or one department at a time. It is slower but safer and easier to manage, because problems in one stage can be fixed before moving to the next. …

Do not mix up the three: 'parallel' means old and new run together, whereas 'phased' means new modules are added one after another. Match each approach to it …