Discovering algebra

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A pity that the article does not include any excerpts from the books or detailed critiques of what's wrong with them. Examining a Discovering Algebra book at http://www.amazon.com/Discovering-Algebra-Investigative-Appr... suggests that the book is not so bad (though obviously this only allows previewing a few pages)...however, I'm unsure whether this is even the same book, since the OP doesn't mention the name of the publisher. It's hard to judge whether the books themselves are poor or whether the failure stems from teachers unwilling to adapt to a knowledge-building rather than a purely didactic approach. Education is important and worth spending money on but (as a European) I'm frequently horrified by American teachers, whose union seems defensive even of members who exhibit basic deficiencies in literacy or numeracy. It's still strang…