Which phase of the COBIT framework focuses on defining justifiable business cases?

The phase of the COBIT framework that focuses on defining justifiable business cases is indeed Phase 4. This phase is titled "Manage and Optimize IT." In this context, creating justifiable business cases is crucial because it involves aligning IT initiatives with business objectives to ensure that investments in IT deliver value and support the overall goals of the organization.

In this phase, organizations assess the costs, benefits, risks, and opportunities associated with IT investments. The emphasis on justifiable business cases is intended to promote informed decision-making, ensuring that stakeholders understand the rationale behind investments and how they contribute to business outcomes. By developing a solid business case, enterprises can prioritize projects, allocate resources appropriately, and ultimately enhance communication among various stakeholders about the expected impacts of IT initiatives.

This alignment and justification process is an essential part of effective governance, as it allows organizations to establish a clear connection between IT service delivery and business performance, thereby reinforcing the value that IT brings to the organization.