A large literature considers why children work, but little is known about why children participate in activities that are labeled worst as the forms of child labor. Case-control approaches common in medicine are adapted to consider the correlates of participation in worst forms in the context of three activities that the Nepali government has labeled as among the worst forms of child labor in Nepal: child domestic service, portering, and rag picking [Dartmouth college, IZA and NBER WP].