Pigeon Parcels is a delivery company that wants to understand, at a high level, where...

To understand gaps at a high level in the activities a business performs, the best way to document the desired state is a Business Activity Model (BAM). The documentation explains that gap analysis compares a current state with a desired future state and that a BAM provides a conceptual overview of the desired future business system—showing what activities should exist to fulfil a stakeholder perspective (or an agreed consensus perspective).

This makes the BAM ideal for identifying “activity gaps” because the analyst can examine each activity on the desired-state BAM and assess whether it exists today, whether it operates satisfactorily, whether it is inadequate, or whether it is missing completely. The text explicitly states that the conceptual nature of the BAM helps the analyst see where the current business system is lacking and that gaps can vary by activity (some may be fine, others weak, others absent).

Option B (“to be” process models) is useful, but it is a more detailed view that focuses on how work is carried out rather than providing a conceptual “what activities should exist” overview. CATWOE (C) helps capture and analyse stakeholder perspectives, but it is not, by itself, the best way to document the desired activity set at high level. A business case (D) justifies change; it doesn’t define the activity-based desired operating picture.