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Luke is a freshman at college. His parents pay for his tuition and housing and provide him with $300 a month for food and other necessities. Luke wants to keep track of his spending so he always has enough money for food and textbooks and knows if he has any extra money for recreational activities as well.
We observed college students (especially ones in dorms without dining plans) who are often left with $5 in their bank account and a couple of packs of ramen to last them through the last few days of the month. Several students were observed calling their parents and requesting more money to get them through the weekend; others who have limited resources were seen ordering takeout that they might not be able to afford. The ability to track spending easily would greatly help all of these students, even if it's just a matter of proving to parents that they really do need more money and aren't spending money frivolously.
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Vader is Luke's 42-year-old father. He wants to keep track of his son's spending so he knows where his hard-earned money is going, and if his son asks him for more money he wants to make sure that his son has been responsible with what he's already been given.
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This task can be performed anywhere with a smartphone. This task is likely to be performed a few times a day. In the case of one’s own budget, one is especially likely to view the budget when one is deciding whether or not to make a purchase, so while at a store with somewhat limited time constraints (the user doesn’t want to spend a lot of time on the task and wants to view the budget quickly). Viewing Viewing someone else’s budget is a more leisurely activity and would likely happen in the comfort of one’s home.