If the other party wrote the agreement based on an oral understanding reached earlier, make certain that the written terms match the terms of your oral agreement. Cover all options, consequences, and possibilities. Deal with the sensitive issue during the negotiations. Don't use unclear language or try to sound like a lawyer. If you don't understand exactly what the other party is expecting you to do, don't try to camouflage the lack of understanding by using vague language.
Vague language leads to misunderstandings, disputes, and lawsuits.
Use simple language that accurately expresses your agreement with the other party. Don't try to sound like a lawyer, and don't complicate things unnecessarily. Define any ambiguous terms. There's a classic contracts case in which one party contracted to sell chickens to the other party. To avoid such misunderstandings, define any terms that may be ambiguous.