To track variations in crime, the Uniform Crime Reports (UCR) summarizes crime information as the Crime Index. The seven crimes that compose the Crime Index are murder, rape, robbery, aggravated assault, burglary, larceny-theft, and motor vehicle theft. By mandate of the U.S. Congress, arson became the eighth index crime in 1979. Because arson reporting is not standardized and in order to continue creating comparable data reports, arson is not included as a part of the Crime Index total. For each of the index crimes, the UCR program collects reports on the number of crimes committed, and for non-index crimes the program tracks only reports of actual arrests. This report indicates that for the first 6 months of 1992, the Index Crime total was 618,193 in Texas, compared with 651,399 for the first 6 months of 1991, a decrease of 5.1 percent. There were 1,102 murders, an 8.8-percent decrease from 1991; 4,730 rapes, a 2.6-percent increase; 22,680 robberies, a 3.4-percent decrease; 43,085 aggravated assaults, a 6.6-percent increase; 135,259 burglaries, a 10.6-percent decrease; 338,885 larceny-thefts, a 4.2-percent decrease; and 72,452 motor vehicle thefts, a 5.6-percent decrease. Data show population-area crime trends, law enforcement officer assaults and deaths, arrest data, and crime by jurisdiction.