Available time for changeovers per period (Ta∆), also called available time for (internal) setups, represents the time per a given period (e.g., day, shift, week) during which a machine, equipment, or resource can be changed over (i.e., from one product to another, prepared for a different medical procedure, cleaned for another customer). Ta∆, is foundational to every part, every interval (EPEI), changeover distribution, and kanban-sizing calculations.

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