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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

TypeInterface#TaskIncidence descriptionEffectAssistance
SlightDM1UNDO 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)  
 DM1The user accepted the default shape of the room; later he was aware of it and changed it  
 DM1Window dimensions were confused with its distance to the wallsPut the proper window by chance 
 DM2 and 3Tried to change the position of a door/window, while another operation (the placement of another door/window) was being in progress  
ModerateGGI1Not consciously placing a window, believing it did not matterConsciously leaves an incomplete task (though not decisive for a correct final result) 
 GGI2Instead of moving a piece of furniture (because this option was not found), deleted it and put another one at the targeted locationInadequate procedure 
 GGI3The user could not see the kitchen in 3DConsciously leaves an incomplete task (though not decisive for a correct final result) 
 DM1Entered the measurements in the default kitchen shape (without choose the correct shape), and did not realize belowWrong final result, unconsciouslyWarning
 DM1The participant was unable to change the shape of the default kitchen, so he decided to start againInadequate procedure 
 DM2 and 3UNDO was confused with CLEAR (wanting to remove a cabinet), throughout the experimentPersistent misinterpretation of an interaction (Inadequate procedure) 
 DM2 and 3Learnt not to DRAG to move furniture → choose delete and put it back at the targeted locationInadequate procedure 
 DM3Chosen wrong furniture (high corner instead of low)Wrong final result, unconsciouslyWarning
 DM3Oblivious to the only sub-task is not explicitly stated: “choose the common elements (granite, wood and handles)”Wrong final result, unconsciouslyWarning
SevereGGI3With everything done, the user would choose “design a plan” (which implies starting again) instead of the “order kitchen” option, so intend to start againIt would enlarge the experiment time without limitHelp
 DM2Does not learn to SCROLL (necessary to choose the desired furniture)BlockingHelp
 DM2Does not learn to DRAG (needed for “placing” the furniture)BlockingHelp
 DM2 and 3Does not learn to DELETE furnitureBlockingHelp
 DM3Does not learn to DRAG (necessary to relocate furniture)BlockingHelp
 DM3Does not learn to DELETE furniture → Try to start againIt would enlarge the experiment time without limitHelp