he meaning of the diagram oveall.</p>

<p>I'm doing this with <a href="http://mcs.open.ac.uk/pgt2/">Pete Thomas</a> and <a href="http://mcs.open.ac.uk/kgw9/">Kevin Waugh</a>.

<p>Moving on to software evolution, we are interested in how large
software systems change over extended periods of time.  Some of this
work has used qualitative simulation techniques to look at the
abstract behaviour of systems.  We've also looked at agent-based
models to simulate the growth of open-source systems.</p>

I'm doing thi