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Viewing Spending Categories
Learnability
Actions are clearly visible and derive from known smartphone menus, the design is very intuitive.
Visibility
This design is very visible, most menus have only a few buttons and they are located in the center of the screen. The affordances of some of the actions is not very clear, as it is not clear which options are editable, and which type of input is required for each field.
Efficacy
The design is very efficient, using the minimal amount of menus and screens to input a receipt
Error Prevention
This design allows easy error prevention using the "retake" button. With just one click the user can recover from an error. Also, re-editing a receipt after it was inputted is pretty easy and straight-forward.
Design 2
Learnability
Most of the options of this design are derived from existing designs of many common smartphone menus. Taking a picture of a receipt and browsing through old receipts is similar to IPhone camera interface and entering and editing receipt and report details is similar to its settings menu. This aspect of the design makes it very learnable for smartphone users. The other elements that do not have a parallel in common menus or application are sufficiently documented, with the buttons stating exactly which action should be taken. One aspect in which the user will have trouble learning the interface, is navigating between the different screens. It is not always clear which button will lead to which screen and with receipt/report the user is currently looking at.
Visibility
The visibility of this interface is not very high. In most menus, most of the screen is dedicated to showing the relevant information and the important controls are small and in the bottom of the screen. The "back" button, when exists, is very small and appears in the to left corner of the screen. Most actions have appropriate affordances, but some do not. For example, the list in 1.2.2 appears like it is editable by clicking on it, when in fact you can only edit it by adding items through the menu on the top.
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