This study was aimed at developing tasks corresponding to six types of human error, which cause serious railway accidents. Types of human error have been classified by a combination of two dimensions induced by a cognitive human error mechanism. One dimension is deficiency of attention, which includes distraction and saturation of attention factors, the other an activation failure of a procedural schema for action and decision, which includes inactivation of a correct procedural schema, an activated habitual incorrect schema, and activated efficient incorrect schema factors. A psychological task was configured for each of the five factors: a digit recitation task for distraction of attention; a vigilance task for saturation of attention; a prospective memory task for inactivation of correct procedural schema; a Stroop task for activated habitual incorrect schema; and another Stroop task after training involving naming a color as a congruent stimulus task for activated efficient incorrect schema. Six human error tasks were configured incorporating these subordinate tasks.