For EMBs with a relatively large number of members it can be advantageous for the EMB to form committees to oversee or manage some of its activities. In Indonesia, the formation of such committees, which are responsible to the full membership of the EMB, has allowed greater specialization and concentration by EMB members on key policy tasks. They may be an advantageous means of rationalizing oversight workloads during periods of peak electoral activity. In some cases, such committees have the power to co-opt non-EMB members, such as professionals from outside the EMB, or EMB secretariat staff. Some EMBs establish a smaller group that is entirely or mainly made up of their members, which interacts with the EMB secretariat on behalf of the members as a whole. In Mexico, the law provides for the permanent use of six committees: electoral training and civic education; electoral organization; political parties; professional electoral service; voter register and reports and complaints. The Nigerian EMB has 15 committees covering core election roles such as logistics as well as organizational matters such as tendering and staff welfare.