This doctoral dissertation reports on results from case studies of how text-talks in a Swedish upper secondary school vocational programme, function as a zone of proximal development for reading. The aim was to investigate how text-talks function as a basis for discussion about the text content and thereby have a potential for developing understanding for the subject-specific text content in the subjects of Carpentry Technology, Welding Technology and Swedish in one class in the first year of the Industrial Technology Programme. The study is qualitative with an explorative approach (Burns 2011). Ordinary teaching and learning contexts were observed. The theorectical frame work is based on sociocultural (Säljö 2000) and sociosemiotic perspec...