Communication is the glue that holds the EMS together.
Failure to communicate will have an effect on what happens in business because you communicate even if saying nothing: dirty and poorly maintained washrooms transmit the message 'We really don't care about your welfare here'.
Communication is not just about telling people things. Many of the changes the EMS brings are new and challenging. Your staff will respond to what you are communicating, whether you have communicated it knowingly or not.
External communication is all about establishing and maintaining confidence and understanding among your stakeholders, that is those external parties interested in your organisation. Further details about the external communication is given in section 10, How to communicate and report on environmental performance.