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- The user expressed uncertainty about the "daily averages" heading in the "usage" view. He was unsure whether the values in the table were the averages for the current day, or the averages from each day across the current month.
- Like user 1, user 3 immediately chose the "device list" view when looking for the device that consumed the most power.
- Also like user 1, user 3 expected to be able to schedule a power transaction from the "storage" view. When he found this was not possible, however, he quickly tried the "grid" view and completed the task.
Prototype Iteration
- Because we had made up our data, numerical values were not necessarily consistent between different graphs. Several users expressed confusion about this inconsistency. In response, we modified our data to ensure that it was realistic and consistent between graphs, allowing users to make accurate comparisons between views.
- We allowed users to view exact numeric y-values after touching an x-value in the graph, as suggested by user 2.
- Many users expected to be able to schedule a transaction from the "storage" view. We made this possible by adding a "sell power" button for each device in the "storage" view, comparable to the "edit settings" button for each device in the "usage" view. Clicking this button switches the user to the "grid" view and launches a new power transaction from the selected device, essentially acting as a shortcut for the "schedule transaction" button.
- We changed the wording of the "daily averages" heading to "______" to address the ambiguity noted by user 3.