Scenario: old ballot counter, writer in pair (experienced), counts by ballot, races are president and senate, counting 50 ballots exactly
Design 1 (Efficiency)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Analysis of Design 1:
Of our final three designs, this one has the best trade-offs between efficiency and learnability, though safety is not quite as high.
Efficiency:
- One-click process: Because the system advances as soon as any option is clicked, the user can proceed quickly without needing to select an option and then press next. One click per page is much faster than two.
- Minimal text: The screen has minimal text, so it is easy for the user to scan the text and find the right option. This reduces the mental processing time required.
Learnability:
- Item selection: Because only one item shows up at a time, the user will quickly learn to just click the appropriate name and that the system will move on. Much of the changing between screens is done automatically, minimizing the need for users to learn system navigation.
- Minimal text: Because there is very little text on each screen, the user has very few choices what to do. This makes it easy to quickly determine the right action to take.
Safety:
- One-click Process: Because the system advances on any click, the user doesn’t have a chance to verify that they selected the correct option, reducing the safety.
- Large Buttons: The buttons are all large, so the likelihood of accidentally clicking the wrong button will be smaller. Users will also see the button depress when clicked, so they will get that feedback about which element has been selected. These together improve the safety.
- Forward/Back Buttons: If the user makes a mistake, she can chose the back button to correct it. Error correction improves safety. The forward buttons let her navigate back to her current position without reentering information – which would increase the likelihood of making another error.
- Status Bar: The user can keep track of how far she is. This allows tracking of how far in the process she is, and in case a ballot got missed or double-submitted, this mechanism will help her catch that error.
Design 2 (Ballot Metaphor)
...