As our investigations relating to collecting practices in the Icon Age have taken a somewhat different turn since we first undertook this work, we have decided to terminate work on this Knowledge Development journey. As noted in the previous post, a wide variety of issues were revealed by the study. It made it clear that the texts selected for mark-up in the present day were often, but not always, distinct from those that had been selected many years before. This was not, in itself, surprising, but we wanted to understand what trajectories of reasoning had changed the most and this was not so easy to pinpoint. We were interested in whether things like the type of document marked up, when it was originally marked up, the place of work at the time, and the interest in the topic would make a difference to the degree of contiguity between the original markup and the new markup. However, none of these seemed to have a consistent effect. More than anything, we have concluded that understanding the nature and relevance of document markup practices for knowledge development is something that would require significant further investigation in its own right.