Assigning is the act of determining and allocating responsibility for particular aspects of care (typically a range of care needs, rather than specific procedures) to another individual. This may or may not include controlled acts.
Any nurse with the knowledge, skill and judgement may assign care to UCPs, however this may be dependent on employer policies.
Supervising involves the monitoring and directing of specific activities and procedures UCPs perform. It does not include ongoing managerial responsibilities.
Often, the nurse who assigns a task also supervises the performance of the task. Supervision can be direct (where the nurse is physically present) or indirect (when a UCP reports back to the nurse through regular check ins).
Delegating occurs when a regulated health professional who is legally authorized and competent to perform a controlled act grants their authority to perform that act to another individual. A number of requirements need to be met to ensure the delegated activity is performed safely, one of which is confirming the delegatee has the knowledge, skill and judgment.
Nurses can only delegate controlled acts that they are competent to perform.