Final answer:
A step-by-step activity or behavior that must be followed is known as a protocol or procedure, often associated with scientific methods and learning processes such as operant conditioning.
Step-by-step explanation:
A step-by-step activity or behavior that must be followed is called a protocol or procedure. These sequences of actions are often found in contexts like scientific research, where following an established scientific method is crucial, or in learning through operant conditioning, where behaviors are reinforced or punished. The process of modeling also involves steps such as attention, retention, reproduction, and motivation, and it's essential for learning new behaviors, as noted by Albert Bandura.