Set a target of nearly your entire employee base on computers, minus your average turnover (since it often takes people a while to get used to visiting an intranet) and expect all of them to visit the site at least once a month. When you find out where you are currently, you can set a series of goals year by year that will lead you to that ultimate level.
Analytics
Measuring the usefulness of e-newsletters
Angela Sinickas explains which online analytics are useful to track for e-publications and which can either be misinterpreted or over-valued.
Measuring Online Usage of “Help” Documentation
Rather than look at statistics overall, you can always install website measurement software that will tell you exactly how many people access various pages like your help screen at your own organization.