Two specific methods congress uses to exercise effective oversight of federal bureaucracy?

The first specific method of congressional oversight identified by the writer is the ability of Congress "to supply or deny funds based on their perception of the effectiveness of the bureaucracy."

The second specific method of congressional oversight identified by the writer is

the ability of Congress, through legislation, to control the jurisdiction of the bureaucracy (i.e. How "the bureaucracy performed it s job or what they were entitled to do.")