What is the key issue for this case? and Based on the case below, what can be the relative legislation of the Alberta Employment Standard, common law principles, and requirements? and also it's solution related to the legislations? Mark has been consistently arriving late to work, sometimes up to an hour after his scheduled start time.

The manager had verbal conversations with him about punctuality but did not document these

discussions. Now, the manager wants to issue a written warning, but Mark argues that he was never

formally warned before.