staircase model
... that there are six floors in the staircase model of terrorism?
... that there are six floors in the <b id="mwDN8"><a href="./Staircase_model" id="mwDOA" rel="mw:WikiLink" title="Staircase model">staircase model</a></b> of <a href="./Terrorism" id="mwDOE" rel="mw:WikiLink" title="Terrorism">terrorism</a>?