This trend study was designed to investigate a development of teachers' concerns about technology integration in the curriculum. The study was conducted by repeated cross-sectional studies, applying the same research instrument to different samples of subjects at different points, over a period of four years during 2004-2007. 275 in-service teachers participated in the study.The study found patterns of concern typical for teachers at different levels of their professional development as well as distinct and stable differences between technology user sub-groups over four years.