Abstract
This paper presents 4 kinds of error orders caused by failure of analyzing meaning of a sentence with compound orders in the cases of plant operation. Next, an example of action mode effect analysis (AMEA) according to objects on contradicted orders is shown. Consequently, this paper indicated importance of "making separation", "making inhibition" and "checking 4 kinds of error orders and changing some relations" as action mode for preventing error instructions in compound instructions.
