ABSTRACT
At the heart of archaeological investigations lie questions about change. These are the big ‘why’ questions where we try to understand the move to agriculture or the factors behind the spread of people to the New World by at least 15,000 years ago. ‘Why’ questions can also be much smaller in scope. They may deal with shifts in the species of animal hunted at a site, the transformation from mud-brick to stone architecture or from circular to rectangular houses, changes in burial customs or the appearance of new styles in art or coinage.
