I have by now managed - with some contortions - to arrive at indices of population for individual archaeological sectors and for regional settlement systems. The real goal, however, is to analyze patterns of change in population though time and across space. In order to do this, a series of additional metrics and analytical techniques are necessary. These fall into three main categories: measures and techniques which analyse changes in population through time, ones that measure changes in population over space, and ones that combine changes through time and over space. These are described and discussed in this section.