COSTS MEASURED WERE ONLY THOSE EXPLICITLY BORNE BY THE SUPERIOR COURTS. COSTS OF LAW ENFORCEMENT, PROSECUTION, DEFENSE, AND THE TIME OF DEFENDANTS AND JURORS WERE EXCLUDED. RESULTS INDICATED THAT CASES WHICH WENT TO TRIAL HAD AN INCREMENTAL COST OF $1,063, VERSUS $447 FOR CASES DISPOSED OF BEFORE TRIAL. CASES IN WHICH THE DEFENDANT PLEADED GUILTY HAD AN INCREMENTAL COST OF LESS THAT $250. USING 1976 AND 1976 DATA, THE INCREMENTAL COST OF A JURY TRIAL WAS $1,772, VERSUS $844 FOR A NONJURY TRIAL. COMPARISON OF CASES IN WHICH TRIALS WERE TERMINATED BEFORE EVIDENCE WAS PRESENTED BY BOTH SIDES WITH CASES NOT TERMINATED SHOWED, HOWEVER, THAT DIFFERENCE IN COSTS BETWEEN JURY AND NONJURY TRIALS WERE LARGELY EXPLAINED BY DIFFERENCES IN THE LIKELIHOOD THAT A CASE WOULD BE TERMINATED BEFORE A FULL PRESENTATION OF EVIDENCE. DATA DID NOT SUPPORT THE HYPOTHESIS THAT A JURY DISPOSTION, AFTER EVIDENCE, IS MORE COSTLY THAN AN EQUIVALENT NONJURY DISPOSITION. A SURPRISING FINDING IN ALL THE ANALYSES WAS THE HIGH ESTIMATED MARGINAL COST ($1,447) OF CASES DISMISSED BEFORE TRIAL OR TRANSFERED TO ANOTHER DISTRICT. THE NUMBER OF TRANSFERS WAS TOO LOW TO BE STATISTICALLY SIGNIFICANT, BUT ANALYSIS OF DISMISSALS SUGGESTED THAT THEIR HIGH COST REFLECTED THE COST OF PRETRIAL HEARINGS. COMPARISONS OF JUDICIAL COSTS ACROSS COUNTIES INDICATED THAT THESE COSTS VARIED SHARPLY FROM ONE COUNTY TO ANOTHER. NOTES, A REFERENCE LIST, AND AN APPENDIX DESCRIBING METHODOLOGY, DATA, AND ADDITIONAL RESULTS ARE INCLUDED. (CFW)