Success factor: qualification and motivation of teachers

Identifying success factors when curricula are similiar?

Singapure and West Virginia share basic  curricula, but the educational outcomes differ. Singapure is highly successful.  Why this difference?

1. Only the top third of secondary-school graduates in Singapore can apply for teacher training.

2. Each year, teachers take an additional 100 hours of paid professional development

3. Profession is paid as well as science and engineering careers.