From the pre-amble to the Texas Disciplinary Rules of Professional conduct:
As a representative of clients, a lawyer performs various functions. As advisor, a lawyer provides a client with an informed understanding of the client’s legal rights and obligations and explains their practical implications. As advocate, a lawyer zealously asserts the clients position under the rules of the adversary system. As negotiator, a lawyer seeks a result advantageous to the client but consistent with requirements of honest dealing with others. As intermediary between clients, a lawyer seeks to reconcile their divergent interests as an advisor and, to a limited extent, as a spokesperson for each client. A lawyer acts as evaluator by examining a client’s affairs and reporting about them to the client or to others.