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To succeed with an application for revision, the filing party must establish, cumulatively, each of four requirements: first, that the fact or facts it wishes UNAT to consider was or were unknown to it and to UNAT at the time the original judgment was rendered; second, that its prior ignorance of this fact or these facts was not due to its negligence; third, that the fact or facts will be decisive of its appeal, that is that they will persuade UNAT to change its earlier decision to one in its favour. Fourth and finally, it must comply with the time limitations in making this application.

The circumstances in which a second or subsequent application for revision will be allowed will be rare and the circumstances in which the Appeals Tribunal might allow it, exceptional. It is, nevertheless, possible that after a first revision application has been decided, further earlier relevant but concealed information comes to light which may be decisive of the original case. There is no statutory restriction upon the number of such applications, although the time limits on making them and the other tests to be passed before a revision can take place will, in most cases, make this a difficult exercise.

To succeed with an application for correction, the filing party must establish that the Judgment contains an error or errors. The errors which may be corrected are clerical or typographical or similar errors or inadvertent slips. This is not, however, a general right of appeal or judicial review.

There is no statutory time limit within which an applicant must apply for correction of an error.  However, to do so is the exercise of a discretion and undue delay in making an application is a factor in the exercise of that discretion.

Although the UNAT is able to and will acknowledge typographical and like errors, omissions, and slips in its judgments, doing so will not necessarily change the result in the case unless the error, as corrected, was so significant that the original outcome cannot stand. The UNAT’s error correction powers are limited to the sorts of errors exemplified in Article 11(2), clerical or arithmetical mistakes, or accidental slips. While this is not a closed category of the sorts of errors that may be corrected, the list exemplifies the relatively narrow range of inadvertent errors and guides the Tribunal in determining such applications.

Costs’ awards are rarely made by the UNAT and then only in extreme cases. The interests of justice usually require that a party should be warned of such a possibility and thereby be aware of it.