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Two Types of Stimulus
publish date: 2026/06/08 10:49:35.914290 UTC
volume_muteBehavioral models respond to two types of stimuli. Match each type to its description and a typical system example.
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Stimulus Type
Data
Event
Description and Example
A trigger that happens in the environment; it may have associated data but not always — e.g., a phone handset being picked up triggers a dial tone in a switching system
Data becomes available that must be processed by the system; its availability triggers the processing — e.g., a phone billing system receives call records and generates a bill
Correct Answer
(1) Data,Data becomes available that must be processed by the system; its availability triggers the processing — e.g., a phone billing system receives call records and generates a bill
(2) Event,A trigger that happens in the environment; it may have associated data but not always — e.g., a phone handset being picked up triggers a dial tone in a switching system
Explanation
Two types of stimulus drive behavioral models: (1) Data — data becomes available and triggers processing; typical of business data-processing systems like billing systems. (2) Events — an event happens in the environment and triggers processing; typical of real-time systems like phone switching systems or embedded control systems.
Reference
Software Engineering, Ian Sommerville, 10th edition