On reading biology text-books Pupils entering secondary school have learnt to read. However, the poor performance often observed by science teachers in using written documents raises the question as to their mastery of reading and invites teachers to identify the areas where an effort in this direction still needs to be stimulated. Global criticism of the level attained by these pupils implies an under-estimate of the multiples difficulties entailed in making sense of the complex texts found in secondary school science manuals. Basic mecanisms are acquired in the primary school, but there are many obstacles on the way to assimilation of scientific text-books, such as interaction between numerous codes, unexplained graphic examples, the la...