Pedagogical design of the contents and didactical aids of educational software is a specific feature of the utilization of information and communications technology in instruction. Educational software designed for instruction means firstly learning. Generally speaking, not even a technological possibility in itself constitutes a panacea to achieve the optimal level of qualification of the teaching-learning process. This article examines the design of educational software which involves three important big moments: establishment of the theme, pedagogical design and computer realisation. These stages need a collaboration of competent specialists in psycho-pedagogical problems, teachers of different disciples and computer programmers.