iv). Content analysis of a series of Mathematics textbook over a trend of time (e.g.
Johansson, (2003). Based on three different curriculum reforms over 27 years (1969, 1980
and 1994) in Sweden, a series of Mathematics textbook was also reformed. She then
compared how the curriculum reforms have caused variations in the series of the textbooks,
by using ten characterizing features (ten blocks) among those already mentioned above. She
found out that; the books progressively increased in pages and not much in variation in
number of exercises and in word problems. The books were comparable and old ones could
still be used.