Synopsis As Introduced Amends the Code of Civil Procedure. Provides limitations upon a non-expert's opinion or inference testimony. Sets forth requirements regarding: qualifications, testimony, disclosure, and compensation of expert witnesses; bases of expert opinion testimony; limitations on expert testimony; pre-trial hearings and disclosures concerning expert witnesses; precedents to be followed in interpreting the new provisions; interlocutory appeals of rulings on the admissibility of expert evidence; standards to be followed by reviewing courts in determining the admissibility of expert testimony; and severability. Provides that the new provisions apply to actions commenced on or after the effective date of the amendatory Act and pending actions in which a trial has not been scheduled or in which a trial has been scheduled more than 90 days after the effective date of the amendatory Act. Effective immediately.