Explain, using examples from different laboratories, why laboratory procedures and practices must be clearly communicated?

You will need to cover the following:

Procedures:
- chemical store management
- ordering procedures
- collection/transport of substances and equipment for disposal
- handling and disposal of radioactive substances
- handling and use of glassware
- handling of solvents and poisons
- uses of ovens
- operation of the fume cupboard

Communicating practices:
- lines of authority and accountability to and from other personnel
- working as a team
- organisation of the laboratory (weekly, daily, etc)
- routines (work schedule briefings)
- reporting of results

Looks like they forgot dealing with chemical accidents and emergencies.

They forgot a lot more also. Hot work, electrical work, etc.

The answer to your question is, of course, for you to figure out. It should be self-explanatory (you can bluff your way through it -- everybody else does).