i) Distinguishing textbooks according to countries (such as the works of Peppin and
Haggarty (2001), Valverde, Bianchi, Wolfe, Schmidt and Houang, (2002)). Third
International Mathematics and Science Studies- TIMSS (1994/ 95)
ii) Restricted Areas of Mathematics concepts e.g. works of Harries and
Sutherland (1999), Li (2000), Project 2061 (2000).
iii) How adherent the textbooks are towards the official goals and objectives of
Mathematics education (e.g. works of Chandler and Brosnan (1995).