A description of the Program Assembly and Monitored Execution for Learning Applications (PAMELA) is presented. It is intended for instructors who propose to use the system and for programers who wish to modify it. PAMELA is an interactive system designed to teach the operating principles of the IBM System/360 digital computer at the machine language level. It runs on an IBM 360 Model 40, communicating with the user via a remote CC-30 Communications Station. The system can assemble and execute programs written in a subset of OS/360 Assembler Language. The source code can be entered from the CC-30 terminal, or from punched cards previously input. It can be edited by insertion, deletion or alteration of statements and instructions can be executed continuously or singly. Contents can be displayed on the CC-300 screen or modified from the CC-303 keyboard. Used in the classroom, PAMELA can provide illustrations of the primary functions of instructions, as well as secondary effects such as setting of the condition code or raising of interrupts. Outside the classroom, the system can serve as a laboratory facility, with which students test and debug their own programs or carry out exercises planned by the instructor. (Author)