Institution First is the concept that distance education is institutionally based(机构化的组织化的) This is what differentiates distance education from self- study. While the institution referred to in this definition could be a traditional educational school or college, increasingly there are emerging non- traditional institutions that offer education to students at a distance. Businesses companies, and corporations are offering instruction at a distance Many educators and trainers are advocating the accreditation of institutions(机构资质认证)that offer distance education to add credibil improve quality and eliminate diploma mills3 • First is the concept that distance education is institutionally based.(机构化的\组织化的) This is what differentiates distance education from self￾study. While the institution referred to in this definition could be a traditional educational school or college, increasingly there are emerging non￾traditional institutions that offer education to students at a distance. Businesses, companies, and corporations are offering instruction at a distance. Many educators and trainers are advocating the accreditation of institutions(机构资质认证) that offer distance education to add credibility, improve quality, and eliminate diploma mills. （一） Institution