A producing sequence is constituted by a plurality of tasks. To manage production, a task difficulty level of a task within the producing sequence is evaluated. INPUT, PROCESS and OUTPUT skill categories are determined by categorizing a skill required for human resource in charge of the task according to cognitive science. The INPUT skill category is related to cognition of outer field information or acquisition of cognitive information. The PROCESS skill category is related to thinking or decision. The OUTPUT skill category is related to behavior or action. The task is evaluated with the INPUT, PROCESS and OUTPUT skill categories, to obtain respectively difficulty ranks. The task difficulty level is determined by processing the difficulty ranks in combination according to overall processing. Also, a risk diagnosis is provided, in which an error influence level of a predictable error of a task within a producing sequence is assessed.
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