"Procedure" differs from "substantive law" in that substantive law defines the rights and duties of everyday conduct. Substantive law includes contract law, criminal law, etc.
A procedural system provides the rules for applying substantive law to real disputes. A procedural system provides guidelines as to what information is received by the judge or jury, how that information is to be presented, and what by standards of proof ("beyond a reasonable doubt," "by clear and convincing evidence," "by a preponderance of the evidence") the information will be judged.
