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<ManualTopic ID="/baanerp/cp/onlinemanual/000440" xml:lang="en">
	<Header>
		<Title xmlns:ssa="http://www.ssaglobal.com" xmlns:HTML="http://www.w3.org/TR/REC-html40">Efficiency factors in Enterprise Planning</Title>
		<Keyword><Level1>Calendars</Level1>
		</Keyword>
		<Keyword><Level1>Productivity</Level1>
		</Keyword>
		<Keyword><Level1>Effectivity</Level1>
		</Keyword>
	</Header>
	<GeneralSection><Paragraph><GUIRef href="/baanerp/cp" role="package">Enterprise Planning</GUIRef> uses <Link href="/baanerp/tc/glossary/glossary#000368" role="glossary">efficiency factors</Link> to take into account variable productivity for lead-time calculation. Various reasons can exist for variability in productivity, such as reduction of work force in the holiday season, or hiring extra work force in busy periods, which, in practice, means that there is more or less available plan time on a certain day.</Paragraph>
		<List><ListIntro>You can define efficiency factors when you set up a calendar in the <GUIRef href="/baanerp/tc/ccp" role="module">Calendars and Periods</GUIRef> module of <GUIRef href="/baanerp/tc" role="package">Common Data</GUIRef>. For each <Link href="/baanerp/tc/glossary/glossary#TimeInterval.tc" role="glossary">time interval</Link>, you can specify an efficiency factor, which SSA ERP uses as a default. You can further overwrite this default value in one of the following sessions:</ListIntro>
			<ListItem><GUIRef href="/baanerp/tc/ccp/tcccp0140m000" role="session">Standard Calendar (tcccp0140m000)</GUIRef>
			</ListItem>
			<ListItem><GUIRef href="/baanerp/tc/ccp/tcccp0142m000" role="session">Calendar Recurrence Working Hours (tcccp0142m000)</GUIRef>
			</ListItem>
			<ListItem><GUIRef href="/baanerp/tc/ccp/tcccp0120m000" role="session">Calendar Working Hours (tcccp0120m000)</GUIRef>
			</ListItem>
		</List>
		<ProcedureSection><SectionTitle>Lead-time offsetting</SectionTitle>
			<Steps><StepsIntro>With the introduction of efficiency factors, the lead-time calculation process in <GUIRef href="/baanerp/cp" role="package">Enterprise Planning</GUIRef> consists of the following steps (in case of forward planning):</StepsIntro>
				<Step><StepTitle>Determine the start date</StepTitle>
					<Paragraph>SSA ERP retrieves data concerning the start date from the Actual Calender session, and proceeds forward day by day, repeatedly subtracting the available planning time from the total lead-time until it comes across the date on which the remaining total lead time is less than the total available planning time. This is the end date.</Paragraph>
				</Step>
				<Step><StepTitle>Determine the efficiency factor</StepTitle>
					<Paragraph>To calculate the exact time on the end date, SSA ERP must determine the efficiency factor that is valid on that date. The formula to calculate the efficiency factor is:</Paragraph>
					<Formula><Paragraph UserLevel="Novice" UserType="Taskuser"> available seconds in day / ((end time - start time) * 3600) </Paragraph>
					</Formula>
				</Step>
				<Step><StepTitle>Convert the lead time from plan hours to actual hours</StepTitle>
					<Paragraph>If SSA ERP knows the efficiency factor, SSA ERP can convert the remaining lead time (planning time) to actual hours according to the following formula:</Paragraph>
					<Formula><Paragraph UserLevel="Novice" UserType="Taskuser"> 
  (remaining) planning hours / efficiency factor
</Paragraph>
					</Formula>
				</Step>
				<Step><StepTitle>Calculate start time</StepTitle>
					<Paragraph>Next, SSA ERP adds the actual remaining hours from the start time of the start date.</Paragraph>
				</Step>
			</Steps>
			<GeneralSection><Note><SectionTitle>Note</SectionTitle>
					<Paragraph>In case of backward planning, the produre is similar, starting at the end date and proceeding backwards to the start date and time.</Paragraph>
				</Note>
			</GeneralSection>
		</ProcedureSection>
		<ExampleSection><SectionTitle>Example</SectionTitle>
			<Paragraph>You have a lead-time of 10 hours and, in a forward planning situation, the planned start date is 01/01/2001. Two calendar lines exist which contain the following details:</Paragraph>
			<TABLE border="1"><TBODY><TR><TH>Date</TH>
						<TH>Start Time</TH>
						<TH>End Time</TH>
						<TH>Efficiency Factor</TH>
						<TH>Cumulative Time</TH>
					</TR>
					<TR><TD>01/01/2001</TD>
						<TD>09:00</TD>
						<TD>17:00</TD>
						<TD>1</TD>
						<TD>8 hours</TD>
					</TR>
					<TR><TD>02/01/2001</TD>
						<TD>17:00</TD>
						<TD>23:00</TD>
						<TD>0.8</TD>
						<TD>4.8 hours</TD>
					</TR>
				</TBODY>
			</TABLE>
			<Paragraph>The lead-time offsetting process is then as follows:</Paragraph>
			<Paragraph>Step 1: Total lead-time minus the cumulative time of the start date:</Paragraph>
			<Paragraph>10 - 8 = 2.</Paragraph>
			<Paragraph>The end date is due to fall on 02/01/2001, as the remaining lead-time (2 hours) is less than the cumulative time on 02/01/2001 (4.8 hours).</Paragraph>
			<Paragraph>Step 2: SSA ERP applies the following formula to determine the efficiency factor:</Paragraph>
			<Formula><Paragraph UserLevel="Novice" UserType="Taskuser"> available seconds in
			 day / ((end time - start time) * 3600) </Paragraph>
			</Formula>
			<Paragraph>In the example this formula gives an efficiency factor of:</Paragraph>
			<Formula><Paragraph UserLevel="Novice" UserType="Taskuser"> (4.8 * 3600) /
			 (23:00 - 17:00) * 3600 17280 / 21600 = 0.8 </Paragraph>
			</Formula>
			<Paragraph>Step 3: The conversion of the (remaining) lead-time to actual hours is then:</Paragraph>
			<Formula><Paragraph UserLevel="Novice" UserType="Taskuser"> (remaining) lead
			 time / efficiency factor 2.00 / 0.8 = 2.5 </Paragraph>
			</Formula>
			<Paragraph>This means that the remaining lead-time amounts to 2 hours and 30 minutes.</Paragraph>
			<Paragraph>Step 4: SSA ERP can now determine the end time by adding up the remaining lead time in actual hours to the start time of the end date:</Paragraph>
			<Formula><Paragraph UserLevel="Novice" UserType="Taskuser"> 17:00 + 2:30 = 19:30
			 </Paragraph>
			</Formula>
		</ExampleSection>
	</GeneralSection>
</ManualTopic>
