Direct Changeover, Instant switch from old to new, Lowest cost but highest risk, Some downtime while systems switch, Testing must be rigorous, Parallel Running, Old and new system run together, Data entered into both, Safest but most expensive and time consuming method, Pilot Running, Used/tested in one area first e.g. one hotel, Rolled out after successful testing, Only one area affected, Small-group training first which can be used across all areas inhouse later, Phased Implementation, Introduced in stages, Gradual staff training and adaptation, Only failed phase needs testing and fixing, Compatibility concerns.

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