Badge and Access Data
The data most organisations already hold. What it genuinely shows, what it misses, and the specific risk of using it.
Methods
Counting methods
Six ways to count, each with different blind spots. Match the method to the question and deploy no more.
7 notes
Desk and Room Booking Systems
Booking data describes intentions, not presence. The gap between the two is the most useful number in the system.
Passive Infrared Sensors
The cheapest and most widely deployed method. What it detects, the failure modes everybody meets, and where it is adequate.
Thermal and Depth Sensors
The methods that count people without identifying them. More expensive than infrared, more capable, and with their own blind spots.
Network and Device Counting
Counting people by counting their devices. Cheap, already installed, and wrong in ways that are hard to correct.
Cameras and Vision Counting
The most capable method and the one with the highest cost in trust. When it is warranted and what has to be settled first.
Which Method Answers Which Question
The methods against the questions you might have, so the choice follows the question rather than the supplier's catalogue.