The purpose of this Part is as follows:
(a) to ensure that parties obtain expert evidence only in relation to a significant issue in dispute;
(b) to restrict expert evidence to that which is necessary to resolve or determine a proceeding;
(c) to ensure that, if practicable and without compromising the interests of justice, expert evidence is given on an issue by a single expert witness;
(d) to avoid unnecessary costs arising from the appointment of more than one expert witness;
(e) to enable a party to apply for permission to tender a report or adduce evidence from an expert witness appointed by that party, if that is necessary in the interests of justice.