A group of people standing in front of a food stamp buying food.
A group buys food at an outdoor food stand.
A guy rides his bike through the Farmer's Market.
The collection of the Musee des Beaux-Arts includes Raphael's La Fornarina.
A boy is eating his lunch.
Nobody is working with a bowl.
All of the dogs have black fur.
Three people sell lemonade by the roadside.
Direct observation and participant observation differentiate case studies from other techniques.