The grounds upon which a decision of an inferior tribunal can be successfully challenged in judicial review proceedings, namely procedural impropriety, illegality and irrationality are settled and trite law. In R Rama Chandran v The Industrial Court of Malaysia & Anor [1997] 1 MLJ 145), the Federal Court held: In this context, it is useful to note how Lord Diplock (at pp 410–411) defined the three grounds of review, to wit, (i) illegality, (ii) irrationality, and (iii) procedural impropriety. This is how he put it: By ‘illegality’ as a ground for Judicial Review I mean that the decision maker must understand directly the law that regulates his decision making power and must give effect to it. Whether he has or not is par excellence a justiciable question to be decided, in the event of a dispute, by those persons, the judges, by whom the judicial power of the state is exerciseable. By ‘irrationality’ I mean what can by now be succinctly referred to as ‘Wednesbury unreasonableness’ (see Associated Provincial Picture Houses Ltd v Wednesbury Corp [1948] 1 KB 223). It applies to a decision which is so outrageous in its defiance of logic or of accepted moral standards that no sensible person who had applied his mind to the question to be decided could have arrived at it. … I have described the third head as ‘procedural impropriety’ rather than failure to observe basic rules of natural justice or failing to act with procedural fairness towards the person who will be affected by the decision. This is because susceptibility to Judicial Review under this head covers also failure by an administrative tribunal to observe procedural rules that are expressly laid down in the legislative instrument by which its jurisdiction is conferred, even where such failure does not involve any denial of natural justice.