A strong voice for outstanding public schools. To promote ethical standards and professional practices among the total membership;to enable members to speak with a common voice on matters concerning the profession; to promote the professional and educational interests of the membership in relations with the community in order to achieve the optimum conditions for education in Lexington; to represent the membership in negotiations with the Lexington School Committee and to represent the membersip for such other purposes as permissible under the law and incidental to the purpose set forth here.