As with other forms of third party recommendations (such as mediation), the choice of expert is vital. The expert must be appropriately experienced and trusted by the parties, otherwise there is a chance their decisions will not be followed. For example, the party that is unhappy with the determination may not comply with the determination until the determination has been confirmed by a court proceeding or arbitration.
The Procuring Authority needs to keep in mind that PPP contracts are complex and typically quite bespoke. If the experts come with a pre-determined approach (e.g. an approach similar to that which would be used for a determination in relation to a traditional construction contract) they might have a tendency to apply such concepts also to a PPP contract, which will not end with a positive or correct outcome.