It may not be as clear how group needs or expectations are limits, but unless you are designing a web page just for yourself, the needs and expectations of the people who you want to use the page are limits. The needs of the users of web site for a Senior Center are different than those of one for small children. Small children need a site that is driven by visual images rather than text. Another is the site name itself. The first has their own domain, while the second is a sub domain of Pens and Quills.
Permissions are another subtle limitation.
If 12 people all have to agree on something before it is added or changed, it is more of a limitation than if one person has the say. If we can help in anyway, please let us know.