The sourcing strategy is crucial for businesses, offering various engagement models tailored to customer needs, such as multisource, co-source, outsource, or service level agreements. These models empower customers to engage high-performing providers while maintaining control over their ICT environment and strategy.

The professional services model is designed to align with specific customer needs for achieving deliverables. Depending on the chosen contracting model, services can be flexibly combined to meet unique customer requirements. Functions are considered as services, not tied to individuals, and may involve multiple individuals with diverse skill sets, excluding contractors or consultants.

Different engagement models are available, adaptable to specific customer requirements or skill sets. Customer-managed implies that the customer has control, access, responsibility, and accountability for the device or service.

Co-sourcing involves joint management or service provision, where the customer oversees the service, and day-to-day operations are fulfilled by the provider, possibly involving a combination of functions supervised by both customer and provider staff.

Outsourcing means the provider takes full responsibility for a division or service, with the customer providing strategic direction. The provider handles fulfillment, including day-to-day operations, budget, and technical strategy.

Certain services may require advanced skill sets intermittently, with a minimum fee charged for resource availability. Some operations may be fulfilled by the provider, and the rest handled in-house by the customer.

This service model differs from co-sourcing, where the customer retains responsibility for the overall business deliverable, while specific functions are the provider's responsibility.