[The dangers of teaching to the middle]
Addressing student differences and interest appears to enhance their motivation to
learn while encouraging them to remain committed and stay positive (Stronge, 2004; Tomlinson,
2004b). Ignoring these fundamental differences may result in some students falling behind, losing
motivation and failing to succeed (Tomlinson and Kalbfleisch, 1998). Students who may be
advanced and motivated may become lost as the teacher strives to finish as much of the
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curriculum as possible (Tomlinson and Kalbfleisch, 1998). It would further appear that students
learn effectively when tasks are moderately challenging, neither too simple nor too complex
(Tomlinson, 2004b).