(iv) not to be in the same room or area with students or other school folks who have completed their vaccination. [11] On 25.11.2021, in line with the impugned Service Circular, the Ministry of Education Malaysia issued a guideline on the control management of Covid-19 epidemic for the Ministry of Education Malaysia (Garis Panduan Pengurusan Kawalan Penularan COVID- 19 Bagi Kementerian Pendidikan Malaysia) (“the KKM Guideline”). The KKM Guideline is to be read with the impugned Service Circular and the impugned Guideline. The KKM Guideline explains the responsibilities of the Head of Department in managing the Ministry of Education Malaysia’s government premises, including officers who are physically present in the said premises. Under the KKM Guideline, the Head of Department shall consider any appropriate means to manage officers who are still required to attend but are not being vaccinated or not completely vaccinated including to instruct such officers to undergo Covid-19 tests from time to time. The Head of Department may also confirm or support (memperakui) such officers for their relocation or replacement. In the event if the Head of Department neglected in complying with the KKM Guideline, the Head of Department himself may be subjected to disciplinary action. In any circumstances, the KKM Guideline is not the subject of this application, but it demonstrated the determination of the Government in combating Covid-19. This is in line with the spirit of the impugned Guideline and the impugned Service Circular. Principles relating to Judicial Review [12] With regard to judicial review, it is trite law that a decision in relation to the exercise of public duty or function may be reviewed on the grounds of illegality, irrationality, procedural impropriety or disproportionality. What amounts to illegality, irrationality and procedural impropriety has been succinctly laid down by Lord Diplock in the case of Council of Civil Service Unions & Ors v. Minister of Civil Service [1985] AC 374 which was adopted by the Federal Court in the case of R Rama Chandran v. The Industrial Court of Malaysia & Anor [1997] 1 MLJ 145 as follows: “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 exercisable. 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. Whether a decision falls within this category is a question that judges by their training and experience should be well equipped to answer, or else there would be something badly wrong with our judicial system. To justify the courts' exercise of this role, resort I think is today no longer needed to Viscount Radcliffe's ingenious explanation in Edwards v. Bairstow [1956] AC 14, of irrationality as a ground for a court's reversal of a decision by ascribing it to an inferred though undefinable mistake of law by the decision maker. 'Irrationality' by now can stand on its own feet as an accepted ground on which a decision may be attacked by Judicial Review. 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.” [13] Notwithstanding the foregoing approach, it has also been decided by the Federal Court case of Ranjit Kaur S Gopal Singh v. Hotel Excelsior (M) Sdn Bhd [2010] 8 CLJ 629 that, only in the most appropriate of cases the Rama Chandran (supra) approach is applicable. Cases involving issue of public policy, national interest, public safety or national security are not amenable to the approach taken in Rama Chandran (supra). [14] Founded on the above mentioned principles, this court will proceed to consider this application. Analysis [15] The issues to be addressed in this judicial review is whether the respondents, in coming out with impugned Decisions, have done so within the boundaries of the laws, rules and regulations, or whether the impugned Decisions have been tainted with illegality, irrationality and/or Wednesbury Unreasonableness or proportionality such that this court should exercise its powers to quash them. [16] At the outset, Senior Federal Counsel for the respondents in attempted to convince this court to dismiss this application for judicial review on the reason that, in light that the KPM Guideline 3.0 has been replaced, the matter has become academic and therefore need not be considered by this court. [17] Nonetheless, for the purpose of completeness and clarity, this court will consider the grounds put forth by the applicants in this application for judicial review. Illegality and/or Irrationality and/or Unreasonableness and contrary to the Principles of Natural Justice [18] The applicants argued that the impugned decisions are tainted with illegality and/or irrationality. The applicants raised several reasons in support of their contention. In this regard, the main complain of the applicants is on the impugned Service Circular. [19] The applicants highlighted several occasions on how they are being discriminated and/or being treated unfairly: