Solve the problems, such as: record work can correctly be grasped using the chain saw by providing a kind of chain type saw, and prevention occurs disaster, can be used for the work of safety management.SOLUTION: chain saw work evaluation system includes: works acquisition unit, for obtaining the building site of work information time chain saw in use Transition probability matrix generating unit, according to the work information that work information is obtained by fetching portion, creating unit work transition probability matrix, an expression probability, wherein each element manipulation includes multiple element work in next step element manipulation The more pre-stored reference data in portion, and element manipulation transition probability matrix are determined with abnormal, and determination has without exception.In selected attached drawing: Fig. 3COPYRIGHT:(C) 2016, JPO& INPIT
