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She decides to get more information about the expensive, but highly-rated Trek bicycle. To do so, she simply taps on the arrow in the Reviews Shopping Cart. This brings her to a page that shows price, description, and collections of reviews. After looking over it, she is decides to buy the Trek, there in the store.
Analysis - Design A
Efficiency
In this design, the user has a different screen for each decision. For instance, the user also must take one picture of each object individually. Then when all of the pictures have been taken, the user decides which object to review. This choice seems to be irrelevant, because the user should not have spent time taking pictures of object he/she does not want to review. Efficiency can be improved by aggregating the 'snap picture' and 'choose objects to review' subtasks into less screens. For instance, one picture could be taken and the very next screen shows the shopping cart with information about each object specified.
For the purposes of this application, the user must spend time annotating the picture to specify which object to review. The method of annotation in this design is very quick and efficient.
Learnability
Design B
This time, Sally can collect information about all the products she’s interested in more quickly by taking pictures that each have multiple bicycles in them:
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