text: why do organizations need both a constitution and bylaws? why not just one or the other? we're in the process of revising the constitution and bylaws of a not-for-profit. as they stand, they repeat each other to a great extent. i'd like to consolidate them into one document, but people are telling me that we need both. why? your bylaws and the constitution shouldn't really be the same although there might be overlap. perhaps the best analogy is the us constitution, its amendments, and federal law. your constitution should state: 1) the goal of the organization 2) the reason for this goal 3) the means for achieving this goal 4) the basic structure of the organization 5) the basic rules/expectations/ethics for attaining 1-4.   once the constitution is created, the bylaws are the nitty-gritty rules and procedures to follow.  these are the things that are easy to change by simple majority or plurality.  if there is to be any change in the constitution it usually requires a 2/3 vote or some greater membership participation.  bottom line - you want the constitution to reflect the basic ideals, principles, rules, and structure of the organization.  bylaws are specific detailed rules/guidelines that help maintain and promote your constitution.