According to Mandate 3, subsection 2.1.1, all justifications must be based on the following principles:
These justifications shall be applied to all future requests, with the understanding that the application of them shall be subject to change without notice.
Further justifications can be found on the Subsection 2.1.2: The Rationalizations page.
Or, if you're really bored, you can try Subsection 2.1.3: The Excuses.