 Understanding the Scenario:

SIAMRUS will be the service integrator.

Merging development teams from ZYXS and ZYXUK to provide global application development and support.

ZYXS will provide centralized service desk, desktop support, and field engineer support.

OUTSCO will provide hosting, e-mail services, WAN, and LAN under new contracts.

Services currently hosted by ZYXS or ZYXD will transfer to OUTSCO.

Merger with Tokyo-based competitor transferring services to ZYXS and ZYXUK, with planning just starting.

 Analyzing the Options:

Option A:Big bang approach risks overwhelming resources and causing significant disruptions.

Option B:Phased approach by organization and location might introduce inconsistencies and complicate management.

Option D:Phased approach by incumbent service provider may not address all service areas effectively.

 Selecting the Optimal Approach:

Option C:Phased approach by service or group of services ensures that each service or related group of services is transitioned smoothly and managed effectively. It allows for controlled testing and integration, minimizing risks and ensuring continuity.

 Justification:

This approach provides flexibility and ensures that each service can be managed individually, allowing for adjustments as needed.

It aligns with best practices in ITIL and SIAM for managing complex transitions and integrations effectively​​​​.