The choice of a single or multiple realm architecture has effects on both the business’s finances and operations. The user of realms can be redesigned over time as the business develops, though, because code and data can be moved across realms. For example:
As long as business outcomes support the financial side, permit a site — or group of sites — to transition from a common realm to one of their own.
As opposed to this, combining a site or sites from different realms into a single realm is more difficult and probably calls for the refactoring of the code.
Creating a realm architecture solution where several realms are required should be avoided at all costs, regardless of the commercial implications of the multiple realm approach, since it will make it difficult (if not impossible) to fulfil the business objectives.
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