The U. S. Department of Education's conducted a meta-analysis of over 1000 empirically-based practices in online learning from 1996 to 2008. Major findings include:
* Blended and online conditions result in similar learning performance.
* Video and online quizzes do not impact student learning.
* Learning is enhanced when learners can control their interaction with media, and reflect.
* Group guidance is not as effective and individual guidance.
US Dept. of Education. (2010). Evaluation of evidence-based practices in online learning.