Working on a new calculus textbook can be a daunting project, and it is something that HÃ¥kan Lennerstad knows a bit about. He happens to be a faculty member at the Blekinge Institute of Technology in Sweden, and he recently created this paper (along with two of his students, Maria Salomonsson and David Erman) that describes how he was able to develop new ways of learning calculus while working collaboratively with his students. This paper was released in June 2007, and in the article he talks about the process involved with creating this textbook and how he worked effectively with his students. It's a rather interesting piece, and one that fellow mathematics educators will want to look over and pass along to other colleagues.