ISTQB Certified Tester Foundation Level – Agile Tester (CTFL-AT) — Question 6

You are developing the code that controls an industrial Espresso machine which will be operated by waiting staff in restaurants.
The machine is rather complicated and has lots of switches and buttons, so in the next iteration instructions will be provided to the operator on a small LCD screen.
A User Story for the Operator-Instructions module is as follows:
“As an operator of the Espresso machine, I would like to know how to steam milk, so I can add steamed milk to the coffee.”
The following is a list of risks identified for this story, with assigned probability and impact.

Answer options

• A. Operators will not read the instructions and will try various switches and buttons until something works. Probability: Low. Impact: Low
• B. The instructions may be incorrect or appear in the wrong order. Probability: Low. Impact: High
• C. An untrained customer will attempt to use the coffee machine. Probability: High. Impact: High
• D. A small child may try to steam milk. Probability: High. Impact: Low

Correct answer: B

Explanation

Option B is correct because having incorrect or poorly ordered instructions can lead to significant issues during operation, increasing the risk of misuse. Options A and D have low impacts and probabilities, meaning they are less likely to disrupt operations. Option C, while having a high impact and probability, does not directly relate to the provided User Story about operator instructions.