▁cogn itive ▁theory ), ▁behaviour al ▁change ▁is ▁determined ▁by ▁environmental , ▁personal , ▁and ▁behaviour al ▁elements . ▁Each ▁factor ▁affect s ▁each ▁of ▁the ▁others . ▁For ▁example , ▁in ▁con gru ence ▁with ▁the ▁principles ▁of ▁self - e ffic acy , ▁an ▁individual ' s ▁thoughts ▁affect ▁their ▁behaviour ▁and ▁an ▁individual ' s ▁characteristics ▁el ic it ▁certain ▁responses ▁from ▁the ▁social ▁environment . ▁Like wise , ▁an ▁individual ' s ▁environment ▁affect s ▁the ▁development ▁of ▁personal ▁characteristics ▁as ▁well ▁as ▁the ▁person ' s ▁behavior , ▁and ▁an ▁individual ' s ▁behaviour ▁may ▁change ▁their ▁environment ▁as ▁well ▁as ▁the ▁way ▁the ▁individual ▁thinks ▁or ▁feels . ▁Social ▁learning ▁theory ▁focus es ▁on ▁the ▁reci pro cal ▁interactions ▁between ▁these ▁factors , ▁which ▁are ▁hypoth es ised ▁to ▁determine ▁behavior al ▁change . ▁ ▁Theory ▁of ▁reason ed ▁action ▁The ▁theory ▁of ▁reason ed ▁action ▁assumes ▁that ▁individuals ▁consider ▁a ▁behaviour ' s ▁consequences ▁before ▁performing ▁the ▁particular ▁behaviour . ▁As ▁a ▁result , ▁intention ▁is ▁an ▁important ▁factor ▁in ▁determ ining ▁behaviour ▁and ▁behaviour al ▁change . ▁According ▁to ▁Ice k ▁A j zen , ▁intent ions ▁develop ▁from ▁an ▁individual ' s ▁per ception ▁of ▁a ▁behaviour ▁as ▁positive ▁or ▁negative ▁together ▁with ▁the ▁individual ' s ▁impression ▁of ▁the ▁way ▁their ▁society ▁perce ives ▁the ▁same ▁behaviour . ▁Thus , ▁personal ▁attitude ▁and ▁social ▁pressure ▁shape ▁intention , ▁which ▁is ▁essential ▁to ▁performance ▁of ▁a ▁behaviour ▁and ▁consequ ently ▁behaviour al ▁change .