The correct answers are: Membership is voluntary; Tasks are not assigned by management; Communication is open and informal.
An organisation can be described as a collection of groups both formal and informal.
It is important not to underestimate the importance of groups within an organisation. Elton Mayo first established this point through the Hawthorne Experiments.
It is also important to remember that there are alliances and power structures that exist within an organisation, other than those documented in an organisational chart.
