I have a particular interest in improving ethical decision making as my review work allows me some insight into the workings of agencies.
Vicarious liability is being held liable for the actions of the supervisee when these were not suggested, or even known, by the supervisor.
Therefore, if a supervisory relationship exists, the supervisor can potentially be held liable for any negligent acts of the supervisee.
Direct liability would be charged when the actions of a supervisor were themselves the cause of harm to a supervisee or a client (for instance, if a supervisor suggested (and documented) an intervention that was determined to be the cause of harm).
The supervisor does not have to actually carry out the intervention, but if the supervisee follows the suggestion of a supervisor and this results in harm – this is direct liability.