During the 1980s correctional officials focused considerable energy on the development of intermediate sanctions as alternatives to incarceration. One such alternative is electronically monitored home detention. Although the electronic monitoring equipment was not commercially available until late in 1984, programs were operating in all 50 states by 1990. This study presents a comparative analysis of three electronic monitoring programs: a program for adults charged with a criminal offense and unable to obtain pretrial release; a program designed as an alternative to incarceration for convicted adult offenders; and a program for adjudicated juvenile burglars. Each program operated in the same jurisdiction, used essentially the same equipment, and imposed similar rules and restrictions on behavior. The analysis focuses on comparisons of program delivery, clients' performance, and programmatic sources of variation. The implications of the findings for future program development and evaluation are discussed.