design preso #2

House of CartsSo here’s the problem:

● Collaborative grocery shopping is difficult

● Need to track what communal groceries were bought

● Coordinate payments for shared groceries

Meet Ryan the Roommate● Frustrated by difficulty

of selecting communal

groceries

● Which foods are shared?

● What did my

roommates already buy?

Meet Randall the (Other) Roommate● Frustrated by process of

collecting money

post-shopping

● Tracking receipts is hard

● Message all roommates

separately to get paid

MVP● Payment sharing

● Track which groceries are to be

shared

Use Case● Ryan is going shopping

● Needs to know what to buy

Use Case● Ryan is going shopping

● Needs to know what he

already has

Use Case● Randall wants his money

back

● (Ryan better have my

money)

● Needs to know who bought

what

Use Case● Randall wants his money back

● Needs to know who owes him and who

he owes

Why House of Carts?● Hypothesis: Cooperative shopping is hard

● Learning: Critical MVP features

● Why adopt? Makes shopping easier