<p>In my opinion, <strong>splitting</strong> seems unnecessary since simultaneous equation models and structural equation models are essentially the same thing -- more precisely, simultaneous equation models are a special case of structural equation models (in the structural equation model world, so-called simultaneous equation models would be called path analysis models). This is according to, among others, <a href="http://www.irss.unc.edu/content/pdf/Bollen%20(1987%20SM).pdf" rel="nofollow">Bollen 1987</a>, who claims that this fact is well known. So anyway, to have two separate tags would seem to be splitting hairs, and I think it's actually rather convenient (for our purposes on this site) that they work out to have the same acronym and thus tag.</p>

<p>With that said, I suppose it couldn't hurt to <strong>clarify</strong> the <code>sem</code> tag description to point out that some people using this tag will only have the special case of simultaneous equation models in mind.</p>
