The four part - test for admissibility of expert evidence set forth in R. v. Mohan, [1994] 2 S.C.R. 9 (S.C.C.) remains germane: (slaw.ca)
[12] Mohan sets out the current approach to the admissibility of expert evidence. (bc-injury-law.com)
They set out guidance regarding the admissibility of expert evidence, the responsibilities of the legal teams and the court in relation to such evidence, and othe importance of economy in litigation. (bondsolon.com)