How many levels of instruction does the INFORM LIST have?

• A. Two
• B. Three
• C. Four
• D. Five

Answer: (B)

The question tests how the INFORM LIST is organized in terms of instruction layers. In this framework, instructions are arranged in three levels to separate the what from the how and the exact actions. The top level describes the overall job flow—the sequence of major steps to achieve the goal. The middle level handles subroutines, looping, decision logic, and how those steps are combined, without tying you to specific robot motions. The bottom level contains the concrete robot actions—the exact move commands, speeds, positions, and I/O operations needed to carry out each step.

This three-tier structure keeps things clear and reusable: you can adjust the overall flow without rewriting every command, and you can modify the detailed actions without altering the overall plan. Having only two levels would blur the lines between planning and execution, making changes harder and less safe. Having four or five levels adds unnecessary complexity for this context, beyond what the INFORM LIST typically uses.

So, the INFORM LIST has three levels of instruction.