Human Layer Controls: Can you control what shoes people wear, how fast they walk, bare foot access, wheelchair access etc?… e.g. kitchen staff may benefit from good slip resistant footwear.
Contamination Layer Controls: Can you control ingress of water or contamination, frequency of cleaning, method of cleaning, access to floor when wet? e.g. after cleaning, if the floor is high risk when wet, always ensure floor is fully dry before staff walk on it.
Floor Layer Controls: Is the floor suitable for the required use? Is the slip resistance of the floor durable, can the floor be kept clean? Will the surface finish (including coatings, paints etc) change?
You can measure available slip resistance of the floor in normal use, when clean and dry, and when wet or otherwise contaminated. This enables you to make informed decisions and manage the overall slip risk.
A low risk floor presents a 1:1 million chance of slipping, a high risk floor
presents a 1:20 chance of slipping!