The　behavior　of　beam-to-column　joint　rotation　in　a　steel　frame　has　been　shown　to　have　significant　effects　on　the　internal　force　distribution　and　the　global　deformation　response.　However,　approaches　to　experimentally　quantify　the　joint　rotation　are　not　well　established.　This　fact　impairs　the　applicability　and　comparability　of　research　results　on　joint　mechanical　behavior.　This　paper　compares　different　measurement　methods　in　the　research　literature　on　beam-to-column　joint　rotation　in　steel　frames,　and　proposes　improved　approaches　for　the　experimental　quantification　of　the　rotation　of　welded　joint　and　welded-flange-bolted-web　(WFBW)　joints.　The　feasibility　and　accuracy　of　the　proposed　methods　are　demonstrated　by　the　comparison　of　results　from　simplified　frame　analysis　with　those　from　finite　element　analysis　on　both　partial　and　complete　structural　levels.　(C)　2011　Elsevier　Ltd.　All　rights　reserved.