This paper aims to examine the extent to which the internal discussion of the Defence andCooperation Agreement between Indonesia and Singapore consistent with the bureaucratic politicstheory. Using the null hypotesis and process tracing methods, this paper tests the bureaucratic politictheory, which was first introduced in the foreign policy studies by Graham Allison and PhilipZelikiow. Specifically, this paper asks the following questions: Who are the foreign policy makers inIndonesia with regards to the faith of DCA? What are their stances toward the future of DCA? Howdoes each decision makers advance their own opinion on this matter? What influence their stance?Does the final outcome reflect each actor's initial preference over the outcome? Based on the paper'scontent and other authors' observation, this paper argues that the internal discussion regarding thefuture of DCA is not entirely consistent with the argument made by Allison and Zelikow inbureuacratic politics theory. .