Delivery reliability – Wikipedia

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${displaystyle DR_{T}^{V}}$

=

${displaystyle min({frac {Delivered_{p,c}+Predelivery_{p-1,c}}{Demand_{p,c}+Backlog_{p-1,c}}},1)}$

Note: In the case that supplier notifies the appropriate partner in the supply chain that a promised delivery date/quantity cannot be met which is called delivery early warning (DEW), the sum of DEW issued to reduce the commit for a certain week is added in the denominator.

Else

NULL

Demand: Suppliers confirmed quantity; c: Product identifier; p: Time period e.g. a day, a week, a month …

The cumulation over a period and a group of product identifiers c is done as follows:

${displaystyle DR_{p,c}={frac {sum _{p,c}(DR_{T}^{V})}{count_{p,c}(DR_{T}^{V}<>NULL)}}}$

Singular/delivery and singular/on Time[edit]

Singular case definition[edit]

To fit to the needs of the environment, the granularity of a singular case (

${displaystyle DR_{*}^{S}}$

) has to be defined. In general a singular case is described by an n-Tuple consisting of a set of the following order and delivery details:

• order number
• customer identifier
• product identifier
• wish date of customer
• confirmed date of supplier
• ship to information
• delivery date
• delivery note number

Formula[edit]

1)

${displaystyle DR_{D}^{S}}$

After a singular case has been delivered to the customer its DR is measured as follows:

If (wish date <= arrival date <= confirmed date of supplier) then

DR_{singular case}=1

else

DR_{singular case}=0

arrival date = delivery date + transit time

By cumulating the results of singular cases over a certain period p and, if necessary, additional criteria c (e.g. customer, product, …) the delivery reliability is calculated as follows:

${displaystyle DR_{p,c}={frac {sum _{p,c}(DR)}{count_{p,c}(singularcases)}}}$

whereas p is determined by the arrival date

2)

${displaystyle DR_{T}^{S}}$

After a period has elapsed all singular cases with first confirmed date within period are considered and their DR is measured as follows:

If (wish date <= arrival date <= confirmed date of supplier) then

DR_{singular case}=1

else

DR_{singular case}=0

arrival date = delivery date + transit time

By cumulating the results of singular cases over a certain period p and, if necessary, additional criteria c (e.g. customer, product, …) the delivery reliability is calculated as follows:

${displaystyle DR_{p,c}={frac {sum _{p,c}(DR)}{count_{p,c}(singularcases)}}}$

whereas p is determined by the first confirmed date

0%≤

${displaystyle DR_{T/D}^{S/V}}$

≤100%

See also[edit]

External links[edit]