The definition is functional. A lead hand who assigns tasks, a working foreman, a shift senior, a project engineer who directs a crew: if they have charge of a workplace or authority over workers, they are supervisors in law, whether or not anybody wrote it down. This is the single most common surprise in a prosecution — the charge lands on someone whose business card says something else.
What it means in practice
- Duties are personal. Ensure workers work as required by the regulations and use the required equipment, advise workers of hazards, provide written instructions where required, and take every precaution reasonable in the circumstances.
- Competence is defined, and it has three parts in most acts: qualified through knowledge, training and experience; familiar with the applicable legislation; and knowledgeable about the actual and potential hazards of the work.
- Awareness training is mandatory for supervisors in several jurisdictions, with a record kept — and it is basic awareness, not the competence the act requires. The two are often confused.
- The employer must resource the role, because a supervisor with no time, no authority to stop work and no budget is evidence of a system that was designed to fail.
What it is not
It is not a manager. Seniority does not create the status and its absence does not remove it. A director who never sets foot on the floor may not be a supervisor; the person who runs the night shift is.
It is not a way to move the employer’s duty. Appointing supervisors adds duties; it never subtracts the employer’s own.
And it is not the French encadrement or the Italian preposto as such. The Italian preposto is the closest — a defined figure with its own duties and mandatory training — but it is appointed and, since 2021, must be identified in writing. The Canadian supervisor is defined by what they do. One is a designation, the other is a finding of fact.