Response:

When people ask this they don’t really mean “have you tested it with the minimum and maximum values?” they’re suggesting that the system wasn’t designed to work with the inputs that you’ve given it and they have no idea what it’s supposed to do, other than to go wrong.

Your job is to decide whether or not you can adjust the inputs so that the problem doesn’t occur, or if you have to change the logic to satisfy your requirements.

See Wikipedia: Edge case

Reference:

• Step 16 – Requirements vs specs

Related questions:

• Are you sure it’s a probem?
• How many things did it process?
• Is that spelt right?
• Is there a defect?
• What’s it supposed to do?