1. An excellent discussion of goals and different ways to conceptualise them is given in Treffers (1987).
2. The range of possible projects and various teaching points concerning project-work are well illustrated by the Mathematical Association’s booklet Pupils Projects: Their Use in Secondary School Mathematics. See also ATM (1987), Isaacson (1987) and Mellin-Olsen (1987).
3. Useful discussions about Investigation work are to be found in ATM (1980) Mathematical Investigations in the Classroom, in ATM (1987), and in Isaacson (1987).
4. Other useful writing about group work is in Hoyles (1985), in Slavin et al. (1985), in Bishop and Goffree (1986) and in Barnes and Todd (1977).