Step 1: Concept Identification: The query concerns the "two-step concept" of attitude change, a theory detailing how persuasive messages influence attitudes.
Step 2: Explanation Elaboration:
S. M. Mohsin, an Indian psychologist, introduced a two-step attitude change model. The initial stage is identification, involving the recipient's liking of the message source. The subsequent stage is attitude change, which is facilitated by prior identification.
Heider is associated with Balance Theory.
Janis is recognized for his research on groupthink.
Triplett conducted the initial social psychology experiment on social facilitation.
The "two-step concept" is specifically attributed to Mohsin, distinct from the "two-step flow of communication" model by Katz and Lazarsfeld concerning media influence via opinion leaders.
Step 3: Conclusion: Mohsin proposed the two-step concept of attitude change.