The whole work attempts to identify the role of supervisors in policy implementation at school level in government education system in Karachi, Pakistan. Policies and decisions are made in a center and supervisors carry them out to schools to implement and ensure the enactment on them. Also, they report and inform the Centre about the realities in schools. Being one of the developing countries we assume that policies are made and do not implemented. Policy implementation, in short, is cumbersome in education system because of the continuous changing scene of education. So, this research explores different channels through which the policies and decisions are communicated to supervisors and by supervisors to teachers. Also, discusses the channels used by supervisors to report back to their superiors. This will tell us about the processes of policy implementation and about the successes and reasons of failure of policy implementation. Within the qualitative research paradigm an exploratory case study approach was used to carry out this study. Semi structured interview guide, observation and document analysis as tools were used for data collection.