Subject Pronoun Agreement
Naming the Parties - You begin the contract by naming the parties in the agreement. This may seem obvious, but attorney Mark Cohen of Colorado writes in his article Ten Things to Consider Before Signing a Contract that "a common error is to use the name of a person representing an entity rather than the name of the entity."
Describe the other party's obligations in detail. In the case of out brochure writing example, this might explain that the client is responsible for providing the copywriter with business information in a word processing document to describe the business and the information to be included in the brochure text.