“This can include general communications in the form of safety information, communications between team members or between different teams during operations or maintenance work, and emergency communications. All personnel including employees, contractors and visitors, should have access to key information to help them negotiate the hazards in the work place safely. This may include key findings from risk assessments, induction to site, evacuation drills, emergency instructions, safety warnings and so on.
Communications are very important in a wide range of safety critical tasks and activities such as lifting operations, emergency response, entry to confined spaces, as well as coordination of activities between different parties and organizations.”
Safety critical communications, Health and Safety Executive, http://www.hse.gov.uk/humanfactors/topics/communications.htm
To this can be added: So-called hand-over information between shifts needs continuous management attention.