What is the definition of an opening horizon?

Question

Options

• AThe time available for the MRP run to convert a requirement into a schedule line or a planned
• BThe time available for the MRP run to convert requirements into purchase requisitions or planned
• CThe time available for the MRP controller to convert a purchase requisition into a purchase order
• DThe time available for the MRP controller to convert a planned order into a purchase requisition or

• A
  4% (1)
• B
  4% (1)
• C
  9% (2)
• D
  83% (19)

Explanation

Option D is correct because the opening horizon specifically defines the window of time within which the MRP controller (a human planner) must manually convert a planned order into an actionable document - either a purchase requisition (for externally procured items) or a production order (for in-house manufactured items).

Why the distractors are wrong:

• A and B are wrong because they describe actions performed by the MRP run (an automated system process), not the MRP controller. The opening horizon is about human action, not system automation.
• C is wrong because it misidentifies the starting document - converting a purchase requisition into a purchase order is a procurement step that happens downstream, after the opening horizon has already been used.

Memory tip: Think of "opening" as opening up a planned order for real-world execution. The MRP controller is the one who "opens" planned orders by turning them into purchase requisitions or production orders - and the horizon is simply how much time they have to do it before it's too late to meet the requirement.

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