▁ ▁Theory ▁of ▁planned ▁behaviour ▁In ▁ 1 9 8 5 , ▁A j zen ▁expanded ▁upon ▁the ▁theory ▁of ▁reason ed ▁action , ▁form ulating ▁the ▁theory ▁of ▁planned ▁behaviour , ▁which ▁also ▁emphas ises ▁the ▁role ▁of ▁intention ▁in ▁behaviour ▁performance ▁but ▁is ▁intended ▁to ▁cover ▁cases ▁in ▁which ▁a ▁person ▁is ▁not ▁in ▁control ▁of ▁all ▁factors ▁affect ing ▁the ▁actual ▁performance ▁of ▁a ▁behaviour . ▁As ▁a ▁result , ▁the ▁new ▁theory ▁states ▁that ▁the ▁inc idence ▁of ▁actual ▁behaviour ▁performance ▁is ▁proportional ▁to ▁the ▁amount ▁of ▁control ▁an ▁individual ▁poss esses ▁over ▁the ▁behaviour ▁and ▁the ▁strength ▁of ▁the ▁individual ' s ▁intention ▁in ▁performing ▁the ▁behaviour . ▁In ▁his ▁article , ▁Further ▁hypoth es ises ▁that ▁self - e ffic acy ▁is ▁important ▁in ▁determ ining ▁the ▁strength ▁of ▁the ▁individual ' s ▁intention ▁to ▁perform ▁a ▁behaviour . ▁In ▁ 2 0 1 0 , ▁Fish be in ▁and ▁A j zen ▁introduced ▁the ▁reason ed ▁action ▁approach , ▁the ▁successor ▁of ▁the ▁theory ▁of ▁planned ▁behaviour . ▁ ▁T ran st he oret ical ▁or ▁stages ▁of ▁change ▁model ▁According ▁to ▁the ▁tr anst he oret ical ▁model ▁of ▁behavior ▁change , ▁also ▁known ▁as ▁the ▁stages ▁of ▁change ▁model , ▁states ▁that ▁there ▁are ▁five ▁stages ▁towards ▁behavior ▁change . ▁The ▁five ▁stages , ▁between ▁which ▁individuals ▁may ▁transition ▁before ▁ach ieving ▁complete ▁change , ▁are ▁pre cont empl ation , ▁cont empl ation , ▁prepar ation ▁for ▁action , ▁action , ▁and ▁maintenance