This report suggests a number of metrics to be gathered by the WWW server. These suggestions are "blue sky" in the sense that no attempt has been made to determine the difficulty of gathering each metric - I have left that to the programming experts. For each metric a brief rationale is given, explaining where the metric would be useful to Hip or its clients.
It is important to plan a site as a whole: catch the customer's interest and hold them, lead them through a prepared sales pitch, pace the pitch, make the "sell" at the right point, make it easy for them to commit. Statistics can be used to back up this advice.
It is equally important to compare the actual reported statistics with the expected ones, (which would be based upon the planned pitch and the customer's anticipated path through the material). If the actual behavior is not as expected: ask "Why?", and adjust the site structure to try and achieve the desired flow.