The standard does not prescribe a single form, but the BIA has to create clear priorities that the organization can act on. Your template should therefore capture critical products and services, the activities and resources that support them, the consequences of disruption over time, and the points at which disruption becomes unacceptable.
Keep one standard method across the BCMS scope. Consistent fields and scoring make it possible to compare business areas, justify strategy decisions, and show auditors that prioritization is controlled rather than subjective.