What's in it for the Knowledge worker, when you introduce Knowledge Management to an organisation? This is a crucial question you need to answer.
Luckily it's an easy one to answer as well.
The WIIFM for the knowledge worker is simple
"When we have a functioning Knowledge Management framework in place, it will make your life easier. It will provide you with easy access to reliable knowledge that will save you time, will reduce your risk of failure, and will make your results better".
Look at Shell, with their Community forums, where staff browsing the forum estimate that every minute spent on the forum saves them 7 minutes work. That's the value proposition you need to focus on - "Use the KM system and it will more than repay the time you spend".
Then of course you need to make sure that your KM framework really does deliver value to the user; that KM acts as a supply chain to deliver accessible, useful, comprehensible, valuable knowledge to the point of need, be it through connecting people, through collating advice, or through any other means necessary. You do this, through relentless focus on the knowledge customer, and you convince other knowledge workers through the use of stories and social proof.