<qa>  What is the purpose of the Arm 1 to investigate the relationships between putative triggers and drugScientific goals. Arm 1 To investigate the relationships between putative triggers and drug craving and lapse; Arm 2 To investigate interactive effects of electronic-diary reminders, and simplified therapy-assigned homework tasks, on homework completion and therapeutic outcome; Arm 3 Using refinements in our assessment methods, to investigate the role of stress associated with geographical location in drug craving and use. 