<?xml version="1.0" encoding="utf-8"?>
<ManualTopic ID="/baanerp/ti/onlinemanual/000000000000011" xml:lang="en">
	<Header>
		<Title xmlns:ssa="http://www.ssaglobal.com" xmlns:HTML="http://www.w3.org/TR/REC-html40">To calculate lead times for operations and production orders</Title>
		<Keyword><Level1>To calculate lead times for operations and production orders</Level1>
		</Keyword>
	</Header>
	<GeneralSection><Paragraph>For all kinds of purposes it is important to know the lead time of an operation, or the lead time of a production order.</Paragraph>
		<List><ListIntro>In general, an operation consists of the following lead-time elements:</ListIntro>
			<ListItem><Link href="/baanerp/ti/glossary/glossary#000351" role="glossary">Queue time</Link>
			</ListItem>
			<ListItem><Link href="/baanerp/ti/glossary/glossary#000363" role="glossary">Setup time</Link>
			</ListItem>
			<ListItem><Link href="/baanerp/ti/glossary/glossary#ProducTime.ti" role="glossary">Production time</Link>
			</ListItem>
			<ListItem><Link href="/baanerp/ti/glossary/glossary#000352" role="glossary">Wait time</Link>
			</ListItem>
			<ListItem><Link href="/baanerp/ti/glossary/glossary#100102" role="glossary">Move time</Link>
			</ListItem>
		</List>
		<Paragraph>The purpose of the lead time determines the exact calculation of the lead time. For more information, refer to the calculations below.</Paragraph>
		<GeneralSection><SectionTitle>Calculation 1: Lead time for costing purposes, or the lead time in the Item Production Data</SectionTitle>
			<Formula><Paragraph UserLevel="Novice" UserType="Taskuser">
|--Queue--|--Setup--|-------Production--------|----Wait time----|---Move Time---|
                     (Batch size * Cycle time)  (of current W/C)
</Paragraph>
			</Formula>
		</GeneralSection>
		<GeneralSection><SectionTitle>Calculation 2: Lead time for production-order operation planning</SectionTitle>
			<Formula><Paragraph UserLevel="Novice" UserType="Taskuser">
|--Setup--|-------Production--------|----Wait time----|---Move Time---|--Queue of next W/C--|
            (Batch size * Cycle time)  (of current W/C)
</Paragraph>
			</Formula>
			<Paragraph>The computed production-order lead time applies to the sum of all the lead times per operation, allowing for an overlap of operations.</Paragraph>
		</GeneralSection>
		<GeneralSection><SectionTitle>Work-center level: main work centers and (sub)work centers</SectionTitle>
			<Paragraph>SSA ERP defaults the <Link href="/baanerp/ti/glossary/glossary#000351" role="glossary">queue time</Link> and the <Link href="/baanerp/ti/glossary/glossary#000352" role="glossary">wait time</Link> in the <GUIRef href="/baanerp/ti/rou/tirou1102m000" role="session">Routing Operations (tirou1102m000)</GUIRef> session from the <GUIRef href="/baanerp/ti/rou/tirou0101m000" role="session">Work Centers (tirou0101m000)</GUIRef> session.</Paragraph>
			<Paragraph>In previous versions of SSA ERP, if the work center was a sub-work center that had a main work center, and the next operation was carried out on a different work center, SSA ERP added the wait time of the main work center to the wait time of the sub-work center. In addition, if the operation was carried out on a different work center then the previous operation, or when it was the first operation, SSA ERP added the queue time of that main work center to the queue time of the sub work center.</Paragraph>
			<Paragraph>In the current version of SSA ERP, this functionality has been removed. Now, SSA ERP only uses main work centers for aggregation of capacity data in <GUIRef href="/baanerp/cp" role="package">Enterprise Planning</GUIRef>, and SSA ERP no longer adds up queue times and wait times from main work centers and sub-work centers.</Paragraph>
		</GeneralSection>
	</GeneralSection>
	<RelatedTopics><SectionTitle>Related topics</SectionTitle>
		<RelTopic><Link href="/baanerp/ti/onlinemanual/000314" role="manual">Production order lead-times (transfer batch quantity)</Link>
		</RelTopic>
		<RelTopic><Link href="/baanerp/ti/onlinemanual/000053" role="manual">To calculate production times of operations</Link>
		</RelTopic>
		<RelTopic><Link href="/baanerp/ti/onlinemanual/000074" role="manual">To calculate remaining production time</Link>
		</RelTopic>
	</RelatedTopics>
</ManualTopic>
