In this paper we present some general didactic definitions of educational materials and emphasize that in relation to the teachers planning and conducting classes educational materials are educational means, in relation to pupils they are educational sources. The second part of the article presents some empirical findings from the research on the use of educational materials by the teachers and pupils of three programmes of secondary technical education in Slovenia. One of the key findings

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... a pronouncedly marginal position of workbooks in Slovene secondary technical education: teachers and pupils only very rarely use them.