The purpose of this study is to compare the learning achievement of contrast concepts of pre-school children regarding computer assisted and traditional learning settings. The contrast concepts are big-small, long-short, new-old, hard-soft. The study carried out with 36 children a pre-school classroom in Trabzon. Experimental and control groups were formed into two groups of 18 students. Computer assisted instruction was used in experimental group and traditional method was used in control group. Worksheets related to contrast concepts were applied to both groups as post test in order to discover a significant difference among the groups. Moreover, semi-structured interviews and observation forms were applied in both of the groups. The experimental group became more successful compared to control group. (C) 2010 Elsevier Ltd. All rights reserved.