Rather than analysing Section 5 in the abstract, it helps to recall the actual provisions that do expressly permit intervention and check whether each option corresponds to one of them.
- The Act's own express permissions: The Act specifically allows courts to appoint arbitrators where the parties fail to do so, to grant interim measures of protection before or during arbitral proceedings, and to entertain applications to set aside an arbitral award on the limited grounds stated in the Act. These are concrete, named instances of express permission.
- Testing "both parties request supervision": None of the Act's express permissions are triggered simply because the parties want the court involved; the listed instances depend on specific circumstances defined by the Act, such as a failure to appoint an arbitrator or a need for interim protection, not on a general request for supervision.
- Testing "procedural irregularity without specific provision": By definition, if there is no specific provision addressing the irregularity, it does not fall within any of the Act's express permissions, so this cannot be a valid basis for intervention.
- Testing "court considers award unjust on facts": The grounds for setting aside an award are specifically and narrowly defined in the Act; a court's own view that the award is unjust on the facts is not one of those defined grounds, so this also falls outside the Act's express permissions.
- Testing "when the Act expressly permits": This option is simply a restatement of the umbrella principle that covers every one of the Act's actual named instances of intervention, appointment, interim measures, and setting aside, making it the option that correctly generalises all of them.
Since every genuine instance of court intervention under the Act traces back to a specific, express provision, and none of the other options describe such a provision, the correct answer is that a court may intervene when the Act expressly permits such intervention.