In the present article we discuss, evaluate and improve the IDEF0 modeling language. In order to meet end user requirements, we suggest concrete improvements which empower the language to face real world problems such as: human errors, process delays, parallel processes and detail information description. The experimentation field comprised from a common production system. Improved IDEF0 seem to overcome several deficiencies and increase its modeling performance. Results showed that language deficiencies were clarified. Thus, the improvements made, constitute better modeling performance and the development of more reliable models.
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