**3. Verification and validation of the D minus 1 production system**

To verify the implementation of this production system, a manufacturing execution system (MES) is used which refers to the ANSI/ISA 95 Part 3 Activity Models of Manufacturing Operations [22, 28]. The manufacturing operations functions are shown in **Figure 17**.

Verification of D minus 1 system is intended to ensure that the functions of manufacturing operations can be operated by providing properly prepared information from the PPS and PEMPIM dashboards, so the production of each workstation normally run and capable to show good production performance.

The verification process begins with processing the product orders into a production schedule and is detailed at all workstations following scenario D minus 1 for the shipping period ST and the detailed schedule must be available at each workstation. This detailed schedule information is then passed on to the production tracking function to ensure that all materials to be used in the process at each workstation are available. For this purpose, the information is provided on the dashboard in the material tracking function.

To ensure that the process can be carried out, the production resources must be available, and for that, the availability of production resources as schedule is verified by using the information on resource requirements at the workstation using the dashboard of available source information.

The verification process is accepted if the system can provide information about the availability of production materials and resources to the dispatcher for each production plan in each workstation according to the production schedule.

To validate the production system is done by validating the dispatcher function and manufacturing execution. This validation process is intended to ensure that the

#### *Concepts, Applications and Emerging Opportunities in Industrial Engineering*

#### **Figure 17.**

*Manufacturing operation function.*

#### **Figure 18.**

*System validation using capability process.*

production process can run and production targets can be achieved. Information on the completeness of resources and the availability of materials must be processed by the dispatcher to determine that the manufacturing execution in each workstation can be carried out.

The process is declared valid if the process accuracy is ±5 equivalent to bed (EQB), precision <= 5 EQB, probability > 90% and process capability > 0.7, it is used as indicators performance for process validation.

The system has been validated on18 May 2018 (**Figure 18**) in production floor, the result all process performance (as process characteristics) indicate fulfilled performance requirement given, it is mean the system is valid.
