On the one hand, the collection brings together descriptive studies of practical activities in the domains mentioned above, studies that teach the reader those domains “from within”, so that s/he may (re-) discover their constitutive activities in their phenomenal detail – be it in tutorial situations, expert practice or hybrid settings. On the other hand, the collection offers the reader a distinctive reminder of “discovering work” as an ordinary feature of both science instruction and research practice – that is, their directed character, to expose or find something new (at least to the involved student or practitioner) – instead of dismissing that feature on philosophical or sociological grounds (e.g., from a skepticist stance, as integral to many constructivist approaches).