What is "critical" about critical design?

Jeffrey Bardzell, Shaowen Bardzell. What is "critical" about critical design?. In Wendy E. Mackay, Stephen A. Brewster, Susanne Bødker, editors, 2013 ACM SIGCHI Conference on Human Factors in Computing Systems, CHI '13, Paris, France, April 27 - May 2, 2013. pages 3297-3306, ACM, 2013. [doi]

@inproceedings{BardzellB13,
  title = {What is "critical" about critical design?},
  author = {Jeffrey Bardzell and Shaowen Bardzell},
  year = {2013},
  doi = {10.1145/2470654.2466451},
  url = {http://doi.acm.org/10.1145/2470654.2466451},
  researchr = {https://researchr.org/publication/BardzellB13},
  cites = {0},
  citedby = {0},
  pages = {3297-3306},
  booktitle = {2013 ACM SIGCHI Conference on Human Factors in Computing Systems, CHI '13, Paris, France, April 27 - May 2, 2013},
  editor = {Wendy E. Mackay and Stephen A. Brewster and Susanne Bødker},
  publisher = {ACM},
  isbn = {978-1-4503-1899-0},
}