The educational concepts behind Digital Mysteries have been developed through years of research on technology enhanced collaborative learning.
The main ideas of how to best encourage effective collaboration and higher level thinking evolved through a number of design cycles with trials conducted in classrooms with school children. The main publications that explain some of the educational concepts behind the design are:
Lin, M; Preston, A; Kharrufa, A; Kong, Z. (2014)
In "CALL Design: Principles and Practice - Proceedings of the 2014 EUROCALL Conference, Groningen, The Netherlands". Pages: 202-208. PDF here.
Heslop, P., Kharrufa, A., Balaam, M., Leat, D., Dolan, P., Olivier, P. (2013)
Kharrufa, A., Martinez-Maldonado., R; Kay, J., Olivier, P (2013)
In ITS 2013 Proceedings of the 2013 ACM international conference on Interactive tabletops and surfaces. Pages 115-124. PDF here
Kharrufa, A., Balaam, M., Heslop, P., Leat, D., Dolan, P., Olivier, P. (2013).
The Proceedings of the ACM SIGCHI Conference on Human Factors in Computing Systems 2013. (Paris, France, 27 April-2 May). CHI'13
Leat, D., and Nichols, A. (2000)
Kharrufa, A.S., Olivier, P., Leat, D (2010)
In Proceedings of World Conference on Educational Multimedia, Hypermedia and Telecommunications (Toronto, Canada June 28-July 2, 2010) 65-674. (You can download the paper from EdITlib Digital Library)
Kharrufa, A.S., Leat, D., Olivier, P. (2010)
The Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces 2010. (Saarbrücken, Germany, November 7-10, 2010). ITS'10. (The paper and an accompanying video can be downloaded from the conference website)