My main rule for Web pages is: keep the links constant. When designing on-line information, plan to keep the locations constant and the information evolve. References to the address will be scattered across the world in other web pages, on bits of paper and in people's heads. There is no way to change every reference in the world, even with the best tools in the world. Plan web addresses to be permanent.
My second rule for Web pages is: the owner is visible. The larger and more important the web site the more rules about who updates what when are needed. However the minimum rule is to have someone clearly responsible for each document and to label the document with the contact details of that person. By default the Web Master is responsible. However it can be remarkably difficult to contact the web master and usually someone else actually owns the content.
My third rule for Web pages is: just do it. While theory is useful, there is no substitute for practical experience. Just as database designers learn from experience, so do Web designers. Don't let someone with no practical experience do your mission critical Web application.
Three Rules For Web Design © Tom Worthington