B. Ericson, J. Foley, и J. Rick. Proceedings of the 2018 ACM Conference on International Computing Education Research, стр. 60--68. New York, NY, USA, ACM, (2018)interesting set of ideas on how to adapt Parsons problems. Based on past research, which tells what making Parsons hard or easier (any distractors, unpaired distractors, etc) we can adapt difficulty of Parsons problem to students. Got a study in a class.
J. Hughes, и D. Peiris. Proceedings of the 11th annual SIGCSE conference on Innovation and technology in computer science education, стр. 275--279. New York, NY, USA, ACM, (2006)