For example, if the contractor is responsible for installing an Internet modem in a customer`s home, it may include that it is responsible for supplying the modem and installing the modem, laying Ethernet cables by ownership, and quality assurance to ensure that the device is working properly. You can use a letter to start negotiations, or you can replace a formula business agreement with consent. Regardless of this, a letter of consent sets out the terms of a business relationship. The most important thing is that a letter of agreement represents what is expected of all parties involved. A service contract letter includes an agreement between two parties who exchange services/products and money. Before you dive into a new venture, you need to make up an agreement to make sure both parties know what is expected of them. A service contract is a written document describing the terms of the services provided from one party to another. You must use the contract letter if you want to conclude a contract and define the terms of the contract. Identify the customer and the service provider. Please insert contact information for both parties. Although your SLA is a documented agreement, it doesn`t have to be long or overly complicated. It is a flexible and lively document. My advice? Create one with this template and examples and consult your customers for perceived gaps.