Activity sequence literature tips

Hi everyone,

I suppose you are all working on your Activity sequences. In relation to 
that there are two recent papers about constructionism and science 
education in middle school which I think are very relevant:

first in Richard's journal

Making Constructionism Work in the Classroom
Andri Ioannidou, Alexander Repenning, Clayton Lewis, Gina Cherry, Cyndi Rader
in International Journal of Mathematical Learning, 2003, Volume 8, Issue 1


and also

Problem based learning meets case based reasoning in the middle school 
science classrom: Putting Learning By Design into Practice, Kolodner, Camp, 
Crismond, Fasse, Holbrook, Puntambekar,  and Ryan, in the Journal of the 
Learning Sciences, vol 12, No 4, 2003

Regards

jakob