While there are traditional roles for your wedding party to fulfill, we suggest that you focus on the qualities of your family and friends. Think about what each person close to you is good at; what he or she cares most about, and how he or she could help you on your wedding day. Then, consider each of these responsibilities and see how closely each person seems to match the position. These are not set in stone; whatever you feel you need help with, your friends will want to be of use.
For more about choosing your maid of honor, best man and other members of your wedding party, read it at blog.ritani.com.