The Supreme Court has expressed an interest "that Congress be able to legislate against a background of clear interpretative rules, so that it may know the effect of the language it adopts". This report identifies and describes some of the more important rules and conventions of interpretation that the Court applies. Although this report focuses primarily on the Court's methodology in construing statutory text, the Court's approach to reliance on legislative history are also briefly described. In analysing a statute's text, the Court is guided by the basic principle that a statute should be read as a harmonious whole, with its separate parts being interpreted within their broader statutory context in a manner that furthers statutory purpose. The various canons of interpretation and presumptions as to substantive results are usually subordinated to interpretations that further a clearly expressed congressional purpose.