Step one looks for anything that can start a fire (electrical faults, heaters, smoking, arson opportunity), anything that can feed it (waste, storage in escape routes, combustible cladding or linings) and anything that can accelerate it. Step two asks who would be harmed: residents asleep in their flats, visitors who do not know the building, and anyone whose age, mobility or health would slow their escape. In housing, this is where a person-centred fire risk assessment may be needed for specific residents.
Step three is the judgement at the heart of the assessment: how likely is ignition, how fast would fire and smoke spread, and do the existing precautions (detection, means of escape, fire doors, compartmentation, the evacuation strategy) reduce the risk to an acceptable level? Steps four and five turn that judgement into a record: written findings with an action plan, communicated to the people who need it, and reviewed whenever the building, its occupants or the law change.