Prof. Rebecca Waldecker visited St Andrews on August 23rd-29th, 2015. From the report by Markus Pfeiffer, “… During her one-week visit to St Andrews, Rebecca Waldecker, Chris Jefferson, and I discussed many ideas around the notion of fixity, the partition backtrack algorithm first published by Leon and the canonical image algorithm. We found it to be a very productive week and agreed to apply to a further grant to make our work into a longer-term project.”