A manager is planning which interfaces will be needed across the value stream when a...

According to DPI, thefirst step in value stream planning is to involve stakeholders. Stakeholders help identify requirements, expectations, and dependencies, ensuring the value stream design supportsutility (fit for purpose) and warranty (fit for use). Tools and practices (A and B) come later, once needs are clarified. Utility and warranty requirements (C) are critical, but they must be establishedwith stakeholder input, not in isolation.

(Reference: ITIL® 4 Strategist DPI, section on "Value stream mapping – stakeholder involvement in design")