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Usability Experiment Design
One key element of our interface is the interaction of the left and right panes of the menu. Because we have the attributes listing on the left hand pane and the selected attributes and displayed drinks on the right hand pane, we must ensure that the flow of the interaction flows smoothly from adding attributes on the left hand pane to the changes that must occur on the right hand pane.
Particularly, we are interested in testing our "and" method of filtering drinks with attributes that have a parent-child relationship (for example, citrus and lemon). Currently when multiple attributes are added, such as "Rum" and "citrus", only drinks that contain both rum and citrus appear.
we would like to test how to best design the attribute selection to drink display interaction. We have two proposed flows that we will compare. In one, selecting a child attribute such as "orange" removes the add circle on citrus to indicate the "and" filtering method to the user. In the other, no when "orange" is added, the add button only disappears on the "orange" attribute, not on the "citrus" as well.
In an ideal situation, we would test 100 subjects, with half testing one version of the interface and the other half testing the other version. Because we are testing one interface per user, we still must test at least 10 participants.
We believe that the second method, in which the add button only disappears on the "orange" attribute is the best and most intuitive method.
The existence of the add circle is the independent variable. In half of the test cases, adding orange will remove the add button on the "citrus" attribute. In the other tests, it will not. The rest of the interface will remain the same.
We will collect data on the user rating of intuitiveness based on Likert Scale. In addition, we will try to observe subjective cues indicating confusion such as hovering over where the button would be.
If our hypothesis is correct, we should see a higher average intuitiveness rating on the first test prototype in which the "citrus" attribute retains it's add circle when the "orange" attribute is added.