Intro- Systems approach in IR seeks to analyse international relations as a system of interactions of states which are interdependent and interrelated. It is a product of behavioural revolution in IR Morton A Kaplan.-work- systems and processes in International politics Wanted to build a grand theory of international politics which can explain past, present and future of international politics Most suitable for study of international politics because it requires interdisciplinary approach. Also it is non-normative ,value neutral and free from biases Approach takes international politics as an overarching idea and not as a sum of foreign policies. Critical evaluation by traditionalists like Robert J Lieber: Criticised as model building exercise rather than theory building. Many models are hypothetical Just a general explanation of international politics. No analysis Ignore importance of domestic factors, personality factors do not help in making predictions Stanly Hoffmann- strange ...