According to Zuma, his government's policy was directed by what was resolved at ANC policy conferences and national conferences.
Moreover, he said, all of his government's policies were scrutinised by parliament and various interest groups as espoused by the country's constitution.
"It is important to emphasise therefore, that government policy is not the exclusive preserve of the head of the executive. It is often contested at every step of the way by public representatives in Parliament and also by various interest groups," he wrote.
"The head of the executive does not dictate policy but articulates and champions the policies of the governing party.
"The policy development process is transparent and comprehensive. Towards the five-yearly [ANC] Policy Conference the policy discussion documents are sent to the branches for a thorough discussion, and are also made available to the broader public for comments."