The purpose of this study is to examine individuals’ computer based complex task performing processes and strategies in order to determine the reasons of failure by cognitive task analysis method and cued retrospective think aloud with eye movement data. Study group was five senior students from Computer Education and Instructional Technologies Department at a state university. A computer based complex task including a logical reasoning process was developed and utilized. Data was collected with cued retrospective think aloud containing a gaze video replay and eye tracking. All the retrospective protocols were transcribed for analysis then a coding schema was developed iteratively from segments. By drawing area of interest Şelds(AOI) of task panel, eye movement data in specific processes and Şelds were analyzed by using Şxation duration and fixation count metrics