Table 2 Overview of the errors (Slight/Moderate/Severe) specifying the interface (DM/GGI) and the tasks involved
From: Proposal and testing goals-guided interaction for occasional users
Type | Interface | #Task | Incidence description | Effect | Assistance |
|---|---|---|---|---|---|
Slight | DM | 1 | UNDO was confused with CLEAR when wanting to remove an item like a door (the user thought the system had failed because the item was not deleted) | ||
DM | 1 | The user accepted the default shape of the room; later he was aware of it and changed it | |||
DM | 1 | Window dimensions were confused with its distance to the walls | Put the proper window by chance | ||
DM | 2 and 3 | Tried to change the position of a door/window, while another operation (the placement of another door/window) was being in progress | |||
Moderate | GGI | 1 | Not consciously placing a window, believing it did not matter | Consciously leaves an incomplete task (though not decisive for a correct final result) | |
GGI | 2 | Instead of moving a piece of furniture (because this option was not found), deleted it and put another one at the targeted location | Inadequate procedure | ||
GGI | 3 | The user could not see the kitchen in 3D | Consciously leaves an incomplete task (though not decisive for a correct final result) | ||
DM | 1 | Entered the measurements in the default kitchen shape (without choose the correct shape), and did not realize below | Wrong final result, unconsciously | Warning | |
DM | 1 | The participant was unable to change the shape of the default kitchen, so he decided to start again | Inadequate procedure | ||
DM | 2 and 3 | UNDO was confused with CLEAR (wanting to remove a cabinet), throughout the experiment | Persistent misinterpretation of an interaction (Inadequate procedure) | ||
DM | 2 and 3 | Learnt not to DRAG to move furniture → choose delete and put it back at the targeted location | Inadequate procedure | ||
DM | 3 | Chosen wrong furniture (high corner instead of low) | Wrong final result, unconsciously | Warning | |
DM | 3 | Oblivious to the only sub-task is not explicitly stated: “choose the common elements (granite, wood and handles)” | Wrong final result, unconsciously | Warning | |
Severe | GGI | 3 | With everything done, the user would choose “design a plan” (which implies starting again) instead of the “order kitchen” option, so intend to start again | It would enlarge the experiment time without limit | Help |
DM | 2 | Does not learn to SCROLL (necessary to choose the desired furniture) | Blocking | Help | |
DM | 2 | Does not learn to DRAG (needed for “placing” the furniture) | Blocking | Help | |
DM | 2 and 3 | Does not learn to DELETE furniture | Blocking | Help | |
DM | 3 | Does not learn to DRAG (necessary to relocate furniture) | Blocking | Help | |
DM | 3 | Does not learn to DELETE furniture → Try to start again | It would enlarge the experiment time without limit | Help |