Writing -or building, if you prefer, a business case is a matter of stacking up the benefits (tangible and intangible) against the costs (of creating, operating, managing and maintaining !! the system over a meaningful number of years (intranets - maybe 1-2 years into the future). I agree with Toby - build it and they will not come....... unless the business case successfully answers (for the users) the killer question "What problem is this intranet solution fixing ?" Of course, if nobody gives a rat's arse about the problem, nobody will care about the solution. A negative business case ought to kill off the project (excellent for getting rid of unwanted pets) - but a sound and positive business case not only provides the justification for spending the cash - it also names and prioritises the deliverables (i.e. the benefits) and therefore helps in planning the project and later - in evaluating whether the project has been sucessful.