Gears　as　the　key　transmission　parts　of　machineries　are　widely　used　in　mechanical　and　aeronautical　fields.　GeoSpelling,　a　framework　standardized　as　ISO　17450-2005　supported　tolerancing　process　by　a　set　of　concepts　and　mathematical　algorithms,　is　a　coherent　and　complete　model　to　manage　the　shape　variations　of　geometrical　parts.　Considering　current　gear　specification　standards　incline　to　inspection　convenient　ignoring　tolerance　quality　control,　so　it　is　a　realistic　necessary　to　develop　a　coherent　gear　specification　model　based　on　GeoSpelling　language.　This　model　should　not　only　consider　integrating　functional　requirements　involved　in　design　stage　but　also　be　able　to　correspond　to　manufacturing　and　inspection　procedures.　In　this　paper　a　new　approach　based　on　discrete　geometry　is　introduced　to　design　gear　specification　model.　It　is　also　focus　on　a　perspective　discussion　on　how　SSA　(Statistical　Shape　Analysis)　method　could　be　a　solution　to　analyze　the　gear　integrated　errors　into　different　individual　errors,　such　as　tangential　composite　error,　tooth-to-tooth　tangential　composite　error,　pitch　accumulated　deviation,　tooth-to-tooth　pitch　accumulated　deviation　and　geometric　eccentricity.　The　fundamentals　mentioned　above　provide　a　reliable　methodology　for　analyzing　gear　manufacturing　errors.　As　a　result　it　is　able　to　enhance　the　computational　processing　capability　and　metrological　traceability　for　gear　quality　control.　(C)　2015　The　Authors.　Published　by　Elsevier　B.V.