title: Why isn't IDEF popular while UML is?
body: <p>I've found out about <a href="http://en.wikipedia.org/wiki/IDEF" rel="nofollow noreferrer">IDEF</a> just yesterday and wondered immediately why it's not more popular than UML. Judging from <a href="http://paginas.fe.up.pt/~jpf/teach/ERSS/UMLvsIDEF.pdf" rel="nofollow noreferrer">documents</a>, IDEF is at least as suitable for software modeling as UML is, but is mature and stable for about 30 years now, as opposed to UML.</p>
  
  <p>Is this one more case of "popular vs. powerful" like all the discussions about "$language vs. Lisp"?</p>