<p>I think there is no clear-cut distinction possible. This is something inherent to all interdisciplinary fields (e.g. Systems Biology). For the case of Operational Research I think that only a relatively small number of operational research questions could fit neither on <a href="https://stats.stackexchange.com/">CV</a> nor on the <a href="https://scicomp.stackexchange.com/">Computational Science beta</a>. The website you mention is rather good too (when it is active). </p>

<p>If the question has a relatively clear statistical concept, I would suggest keeping in CV. If the meat of the question is on optimisation (e.g. "<em>how to express X and Y constraints?</em>"), I would suggest moving it to <a href="https://scicomp.stackexchange.com/">scicomp</a>. Questions without a clear Statistics or Optimisation scope would have to be judged in an individual basis (maybe they should be migrated in <a href="https://math.stackexchange.com/">Mathematics</a>, <a href="https://economics.stackexchange.com/">Economics</a> or <a href="https://quant.stackexchange.com/">Quant. Finance</a>).</p>
