A collection of articles on Improvement Science, published in a special issue (Volume 25 Issue 1) of the journal "Quality Assurance in Education". Each article describes one of seven improvement methods, presents its history, and gives at least one example of it employed in the education sector. The seven improvement methods covered by these articles are: - Networked improvement communities - Design-based implementation research - Implementation science - Lean - Six Sigma - Positive Deviants - Deliverology