Presidential Control And Central Clearance
Presidential Control has been a topic of dicussion for decades, and in this article it gives the step-by-step process on how to achieve that power.
This link discusses the how Congress and the President both try to control Bureaucracy and gives an in dept look at the indiviual bodies in it.
This web page gives links that discuss the President's budget and how it plays a major role in Central Clearance.
This web page gives a closer look at the appointment of Attorneys who make sure policies match up correctly with Legislative matters.