Far and away the best way to start Knowledge Management in a company is through connecting people, and through knowledge pull.
This is faster, more efficient, easier, and delivers better results that the common alternative of starting with knowledge push through collection of documented knowledge. With pull-based connection, and individual with a need for knowledge can ask a community of practice, and receive an answer very quickly, without the need to populate a massive knowledge base first. Communities of practice are very generous with their time, and have no problems with answering a question, however simple and basic.
However there is one point at which a community of practice begins to lose patience, and that is when the question gets asked again. And again. And again. And again. I was reminded of this today, when yet another thread appeared in linked-in asking whether we should rename KM, and if so, what should we call it? This is a question that seems to be asked every second month, and you can get tired of answering it.
You see the same effect in communities in the workplace. People are happy to answer a basic question once. They get tired of answering it 50 times. So what they commonly do at this point, is being to codify some of their answers. They begin to move, of their own accord, from tacit pull, to explicit push.
The first thing they tend to do is write an FAQ, to answer the frequently asked questions in an efficient manner. This often comes about a year into the life of the community, when the frequently asked questions have been identified (by their frequency of asking), and the answers have been kicked around and pretty well worked-up, and it becomes more efficient to answer them once and for all, rather than repeating the answers afresh every time.
I call this point the RTFM moment (for "Read The Flipping Manual.") This is the point where a community can move from Connection to Collection. However they do it of their own accord, and they do it for efficiency reasons, in areas where Collection actually works better than Collection. They see the value of it for themselves; you don't have to persuade them.
There is a lot to be said for letting a Community reach their own RTFM moment, rather than requiring them to Collect from the start; for letting this step evolve, rather than imposing it.