  This paper puts forward the concept of Small Private Online Judge (SPOJ).
Compared with Massive Open Online Judge (MOOJ), SPOJ has advantages in
structured data acquisition of students' virtual behavior for its specific
function and tight coupling with the classroom. SPOJ-based empirical education
research can be conducted within "Acquisition-Analysis-Application" (3A)
Framework. The case study of a SPOJ program clarifies the standard pattern of
SPOJ-based 3A research and highlights the emergence of education-intelligence
concept. The challenges of SPOJ-based empirical education research and
implications of SPOJ are also discussed.
