The dominant complexities of English teaching at junior high schools in lndonesia are about failing on the design of teaching instruction (especially on learning materials and teaching methods) which still cannot optimally reflect on students' needs (in particular of horv to acquire knowledge and select the most effective learning models). This research is to develop learning materials with the complete teaching instructions based on task activities by using CALL at seventh graders of junior high school in Indonesia. In order to entirely develop comprehensive materials, the flrst step is to do need analysis especially identifying task based learning model which fulfils students' expectation. creates, and develops pre task and task cycle (consisting of task. planning. and reporting) into CALL integration of learning modul. The results of the students' need shorv that they like to have appropriate materials for their level, related to real life, variety of media and sources of learning chiefly incorporated to computer which optimizes interactive, contextual, and authentic materials. Therefore the design of its prototype consists of three main steps; pre-task activities are for observing and questioning stage which are implemented by giving English comics rvith thematic situations, main task activities are by exploring, and associating stage which are done by presenting real life situations on videos, songs, and stories which elaborate exercises, role play, and discussion sections, and post task activity, is for communicating stage in that it is to provide more follow-up activities in wider contexts. The evaluation of the final product is done bv validating the materials by means of a group discussion of English teachers.