Hypothesize a rationale for the following design decisions:

What will be an ideal response?

This exercise tests if the student understands the difference between a decision and its rationale. The exact rationale
provided by the student is not important as long as it is rationale (e.g., the answer to the first bullet could have been to
allow snow white’s seven dwarves to purchase train tickets).
• “The ticket distributor will be at most one and a half meters tall.”
Enable children and persons in wheelchair to purchase tickets.
• “The ticket distributor will include two redundant computer systems.”
To achieve a high level of availability such that ticket distribution is not interrupted (and thus, ticket sales not lost in
the case of the failure of one computer).
• “The ticket distributor will include a touch screen for displaying instructions and inputing commands.
The only other control will be a cancel button for aborting a transaction.”
Enable substantial modifications to the interface (e.g., increase the number of tariff zones or the number of products)
without changes to the hardware.