(1) In this Order, unless the contrary intention appears, "a proceeding commenced by writ" includes:
(a) a proceeding in respect of which an order has been made under rule 4.07;
(b) a trial or inquiry under Order 50; and
(c) an assessment of damages or value under Order 51.
(2) In this Order "evidence" means the substance of all of the material evidence to be given by the expert witness in evidence in chief if called as a witness for a party, including, where applicable, the facts, assumptions and reasoning on which the evidence to be given is based and any reports, works, learned writings or other information on which the expert witness has relied or intends to rely for the expression of his opinion.