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Here, he sees his username, a list of the households that he is a part of, his current balance, and the credit card that he has on file. Under these pieces of information are collapsible/expandable lists that detail the bills that he has due, the money he owes to other members, the money thlist of at that other members owe him, and his recent activity. On the left column of the User Page, Rob sees a list of the households he belongs to and a button to add new households. Under that, but also in the left column, is the pertinent information to his most commonly accessed household. Here he sees that household's address, a list of members, and a list of pending members. These pending members are people who have requested to join the household, but have not yet been approved by the members of the household. Rob clicks on the "Add new" button to add a new household.
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Rob then clicks on the "test Household" link itself, which gives him a breakdown of what him and friendUser each owe, and offers him the ability to pay his bill with a "pay" button. Rob is not ready to pay his bill yet, so he decides that he has made enough progress for one day and signs out of his session. 
Analysis 3
Learnability
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The confirmation screen after creating a bill helps prevent error prevention by making users confirm the bill information twice. There appears to be nowhere to edit bills once the bill is created, which will allow errors to propagate if they are created. The detachment of having the delete bills and household from the main interface will prevent accidental deletions helping error prevention. 