<P> The terminology was made popular by Henri Tajfel and colleagues during his work in formulating social identity theory . The significance of ingroup and outgroup categorization was identified using a method called the minimal group paradigm . Tajfel and colleagues found that people can form self - preferencing ingroups within a matter of minutes and that such groups can form even on the basis of seemingly trivial characteristics , such as preferences for certain paintings . </P>
<P> The terminology was made popular by Henri Tajfel and colleagues during his work in formulating social identity theory . The significance of ingroup and outgroup categorization was identified using a method called the minimal group paradigm . Tajfel and colleagues found that people can form self - preferencing ingroups within a matter of minutes and that such groups can form even on the basis of seemingly trivial characteristics , such as preferences for certain paintings . </P>
who has given the concepts of ingroup and outgroup
who has given the concepts of ingroup and outgroup
Henri Tajfel
Henri Tajfel