in the beautiful setting of the Old Library building on the historical campus of the University of Warsaw. The first day was dedicated to the Calco Early Ideas workshop, devoted to presentation of work in progress, with a particular emphasis on talks by PhD students and young researchers. This workshop is the follower of Calco-jnr. The other workshop affiliated with Calco, Calco-Tools, is dedicated to work on tools based on algebraic and/or coalgebraic principles. This year it took place

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... with the main conference which led to discussion during the business meeting about the possibility of making Calco-Tools a track of the main conference instead of a separate workshop.