Here is the problem. I have just started learning UML and that is why I would like to ask for a few cues from experienced users how I could improve my diagram because I do know it lacks a lot of details, it has mistakes for sure etc.

• Renovation company hires workers.
• Each employee has some kind of profession, which is required to work on a particular position.
• Workers work in groups consisting of at most 15 members - so called production units, which specializes in a specified kind of work.
• Each production unit is managed by a foreman.
• Every worker in order to be able to perform job tasks needs proper accessories.
• There are two kind of tools - light and heavy.
  • To use heavy tools, a worker must have proper privileges.
  • A worker can have at most 3 light tools taken from the warehouse.