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Level 0 defines the actual physical processes.
Level 1 defines the activities involved in sensing and manipulating the physical processes.
Level 1 typically operates on time frames of seconds and faster.
Level 2 defines the activities of monitoring and controlling the physical processes.
Level 2 typically operates on time frames of hours, minutes, seconds and sub-seconds.
Level 3 defines the activities of the work flow to produce the desired products.
It includes the activities of maintaining records and coordinating the processes.
Level 3 typically operates on time frames of days, shifts, hours, minutes and seconds.
Level 4 defines the business-related activities needed to manage a manufacturing organization.
Manufacturing-related activities include establishing the basic plant schedule (such as material use, delivery and shipping), determining inventory levels and making sure that materials are delivered on time to the right place for production.
Level 3 information is critical to Level 4 activities.
Level 4 typically operates on time frames of months, weeks and days.
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