  Background: Understanding the condition of OSS projects is important to
analyze features and predict the future of projects. In the field of demography
and economics, health and wealth are considered to understand the condition of
a country. Aim: In this paper, we apply this framework to OSS projects to
understand the communities and the evolution of OSS projects from the
perspectives of health and wealth. Method: We define two measures of Workforce
(WF) and Gross Product Pull Requests (GPPR). We analyze OSS projects in GitHub
and investigate three typical cases. Results: We find that wealthy projects
attract and rely on the casual workforce. Less wealthy projects may require
additional efforts from their more experienced contributors. Conclusions: This
paper presents an approach to assess the relationship between health and wealth
of OSS projects. An interactive demo of our analysis is available at
goo.gl/Ig6NTR.
