Русско-англо-русский юридический словарь

A collective agreement is an agreement made between an employer (or employers' association) and a trade union governing the relationship between the parties. It will only be legally binding upon the parties if in writing and if it states it has legal status. Some of the terms and conditions of individual employment of those employees may be covered by a collective agreement. (Legal Glossary by Clickdocs)

Each time a contract is about to expire, employers must notify their employees or vendors in writing. If you would like to renew the contract, you may include a copy of the new contract or set up a meeting to discuss the new terms. If you are not going to renew the contract, you should tell the other parties in the letter and briefly explain why you are not renewing with them. (ehow.com)

contract of sale Formal contract by which a seller agrees to sell and a buyer agrees to buy, under certain terms and conditions spelled out in writing in the document signed by both parties. An invoice, for example, is a contract of sale. Also called agreement of sale, contract for sale, sale agreement, or sale contract. (BusinessDictionary)

Any changes to the delivery date must be pre-agreed with the BBC in writing. (BBC code of practice)