In countries where either Independent or Mixed Model EMBs exist, electoral legislation specifies the framework for the membership of the EMB. There is a myriad of different legal provisions that govern these critical issues, some of which are more conducive to EMB independence and others less so. A basic difference is in the distinction between a multiparty-based EMB and an expert-based EMB. Some countries have combined elements of both of these and have mixed EMBs.