A risk practitioner is developing a set of bottom-up IT risk scenarios. The MOST important time to involve business stakeholders is when:

Updating the risk register is an ongoing process that might involve stakeholders but is not the most critical point for their input on scenario development.

When developing bottom-up IT risk scenarios, it is most important to involve business stakeholders during the validation phase. Business stakeholders possess critical knowledge of operational processes, strategic objectives, and the real-world impact of IT failures or vulnerabilities on the business. Their validation ensures that the scenarios are realistic, relevant to business objectives, and that the potential consequences are accurately understood and prioritized from a business perspective.

Documenting the risk scenarios is primarily a task for the risk practitioner, although it incorporates input from stakeholders; the validation step ensures accuracy before final documentation.

Identifying risk mitigation controls comes after the scenarios have been defined and validated, making validation a more foundational step for stakeholder involvement in scenario development.