What are the organisation’s mission and goals?Who works in the organisation?

DEVELOPING AN INTERNAL COMMUNICATION PLAN
The first step for an internal communication plan is the same as for an external
communication plan. It has to start by having a close look over the organisation.
This is a list of questions that the management team should answer before
developing an internal communication plan:
What are the organisation’s mission and goals?
What is the organisational structure of the company?
Who works in the organisation?
What characterises the organisational culture and the internal communication?
What communication tools are used within the organisation?
What are the internal communication needs?
How does the management team answer to these questions?