If you opt for an engagement letter or a preservation agreement, the language and meaning must be clear and you must explain the terms of the document so that the client understands the extent of the professional relationship. If you are being held by a client, you should consider confirming in writing the terms of collaboration with the client to avoid any misunderstanding between you and your client. The essential terms of the engagement can be confirmed by a conservation agreement executed by the client or by an engagement letter. The content of the conservation agreement or engagement letter depends on the client and the nature of the case. Below, some of the points that a lawyer or Paralegal may consider must be confirmed by a conservation agreement or a letter of commitment: Technology Practice Tips: Engagement Letters and Retainers Client Service and Communication Practice Management Guideline.