Basically, approving the minutes are done by the same people who were at the meeting when it was taken. This is why general membership meeting minutes are approved by the membership at the next general membership meeting, Committee meeting minutes are approved at the next committee meeting and Board meeting minutes are approved at the next Board meeting. This actually comes from Roberts Rules of Order.
Roberts Rules of Order is considered the authority of the procedural process used for committees, boards and governments. To use a quote from that site:
"The application of parliamentary law is the best method yet devised to enable assemblies of any size, with due regard for every memberās opinion, to arrive at the general will on the maximum number of questions of varying complexity in a minimum amount of time and under all kinds of internal climate ranging from total harmony to hardened or impassioned division of opinion."
Robert's Rules of Order Newly Revised [RONR (11th ed.), Introduction, p. lii]
Information on minutes are available at this link:
http://www.rulesonline.com/rror-10.htm#60 NOTE: Most Associations use a modified version of Roberts Rules of Order when conducting meetings. However, Roberts Rules are not required to be used unless the governing documents specifies that they are. Even if the governing documents specify this, unless there are practicing parliamentarians on the Board, the rules are not completely followed because the average person doesn't have complete understanding of Roberts Rules of Order and won't take the time to learn them.
Hope this helps,
Tim