I had a relative who had a summer job at Ikea monitoring self-checkout:
1) the system and software were unfriendly to both users and staff, especially in error states, as you suggest
2) many people needed rudimentary help
3) no time to look for theft due to 1) and 2)
4) surprising number of couples arguing with each other
1) the system and software were unfriendly to both users and staff, especially in error states, as you suggest 2) many people needed rudimentary help 3) no time to look for theft due to 1) and 2) 4) surprising number of couples arguing with each other