The link below summarizes the research done on best practices in developmental education: contextual learning, supplemental supports (tutoring and advising), accelerated learning. The findings show some promise although long-term benefits are questionable. More rigorous research is needed as well as trying into new approaches to teaching and supporting developmental learners. The article refers to some strategies that we are using at BCC; namely: more intensive advising, early placement testing and curriculum alignment.
(I have done some highlighting of latter parts of the article.)