Count usable capacity.

List the resources required by one appointment, then find which requirement limits simultaneous bookings.

A room may be consumed once per session while equipment is consumed by each attendee. Model those separately.

Pool resources only when they are genuinely interchangeable and available at the location where the appointment occurs.

Minimum attendance controls whether a session should proceed; maximum capacity controls how many people it can safely accommodate.

Build availability from people who can deliver the selected service, not from every employee with an empty calendar.

An employee or asset cannot be in two locations merely because the appointment times do not overlap. Include the transition interval.

Treat an extra as a new capacity requirement when it changes duration, staffing or equipment—not just the price.

Calculate the occupied interval from preparation, service and reset. The customer-facing duration is only one part of it.

Use the worksheet to expose a bottleneck under explicit assumptions, not to predict a merchant scheduler or maximize utilization.