Political Science guys...how is the josh ? Systems approach bhi 3 type ki hai (easton, wallerstein aur Kaplan ki...kal hi pata chala)IMO , I don’t think you should stress about it , apart from wallerstein and Easton , independent approach as a question is less probable. You might use the others as passing references , like political culture for voter turnout and structal functional in political parties and pressure group answers
also, don't confuse IR with comparitive politics
easton is CP, kaplan is IR. Wallerstein is kind of both i think