Greetings friend @honarparvar.

I really like your publications as structures because, without extending too much, you manage to convey a solid and very clear idea.

The theme of your publication reminded me of a little anecdote:

When I was a teenager I formed a rock band ´n Roll with some friends. We had had certain informal presentations.
One day, we had the opportunity to play at a beach club and the manager asked us for a "contract format". We, just a few boys, did not know anything about it.
Fortunately, my father, being a business administrator, handled these terms and wrote us a basic contract.

Seeing your recommendations, I could see that my wise father involved almost all these aspects in that contract.

All the established clauses were very useful and really helped the business relationship flow satisfactorily.

Thank you for this valuable note.

Your friend, Juan.