What implementation strategy is characterized by rolling out a limited functionality version across all regions?

The implementation strategy characterized by rolling out a limited functionality version across all regions is known as phased implementation. This approach allows an organization to introduce a system gradually, facilitating the integration of new functions and features over time. By starting with core functions, the organization can gather feedback, address any issues, and adapt to the needs of different regions without overwhelming users or resources.

This strategy is particularly advantageous as it minimizes risks associated with a full-scale implementation all at once. Each phase can be evaluated for performance and usability, allowing for necessary adjustments before moving on to the next phase. In contrast, other strategies like parallel changeover involve running both old and new systems simultaneously, pilot running tests a full solution in a limited environment, and pilot changeover typically applies to a single site or user group rather than a broader rollout across all regions. This makes phased implementation the most suitable answer for the given question.