Athens Journal of Technology Engineering June 2014 95 The Effect of DIMLE on Computer Literacy Level of Pre-Service Teachers By Zerrin Ayvaz Reis  Sebnem Ozdemir † As a member of digital age, individuals are surrounded by Information and Communication Technologies (ICTs), so their daily life is directly or indirectly influenced. Teachers are one of the most influenced members of society because of the inclusion of ICT into education and the changes in new generation students. The goal of this study is to specify the effect of DIMLE (Dynamic Interactive Mathematics Learning Environment) on pre-service mathematic teachers’ computer literacy. The sample group (n=233) consists of 4th grade students who are given education in Elementary Mathematics Education Department of Hasan Ali Yücel Faculty of Education at Istanbul University, in 2011-2014. The research model is one-group pretest-posttest design. With that model, it is possible to determine whether hypotheses proposed are right or not. Collected data was evaluated by paired sample t-test with SPSS 21.0. The results show that GeoGebra, one the famous DIMLE, has positive effect on improvement of pre-service teachers’ computer literacy level. Introduction Information and Communication Technologies (ICTs) have important potential for improving quality of education from well documenting and tracking of learning process to develop new learning environments and methods (Tinio, 2003; Toki, 2012; Liu et al., 2014). In order to use efficiently and effectively that potential, teachers should have positive attitude, good computer literacy level and willing to discover educational technology. But there is a “push and pull” situation for teachers. For example, feeling less confident about improving ICT usage level, lack of much more practicing in pre-service training (Markauskaite, 2007), weakness in awareness of improving educational technology literacy and low level of theoretical knowledge of educational technology (Liu, et al., 2010) push the teachers. On the other hand, rapid changes in ICTs, popularity and necessity of educational technologies, and distinctive changes in the generation pull teachers into the digital world.  Assistant Professor, Istanbul University, Turkey. † Research Assistant, Istanbul University, Turkey.