How control measures are used to prevent accidents?

A risk assessment is nothing more than a careful examination of what, in your work, could cause harm to people, so that you can weigh up whether you have taken enough precautions or should do more to prevent harm. The aim is to make sure that no one gets hurt or becomes ill. Accidents and ill health can ruin lives, and affect your business too if output is lost, machinery is damaged, insurance costs increase or you have to go to court.
A risk assessment does not need to be complicated. In most firms in the commercial, service and light industrial sectors, the hazards are few and simple. You probably already know whether, for example, you have machinery that could cause harm, or if there is an awkward entrance or stair where someone could be hurt. If so, check that you have taken what reasonable precautions you can to avoid injury.

Your risk assessment tells you that more needs to be done about the risk from the activities under your control. How do you decide what that 'more' should be? In the great majority of case, referring to good practice will give you the answer.