Dynamic Modification
You can determine the inspection frequency for a process in the Quality Inspection Engine (QIE) in different ways. For example, you can use the data from past inspection valuations to calculate the current inspection scope. To be able to react flexibly to this data, you can dynamically modify the inspection scope. This can be achieved using sampling procedures and dynamic modification rules.
With respect to sample sizes and inspection probability, dynamic modification allows you to control the inspection scope for a series of inspection documents so that you will be able to achieve a predefined quality goal with a high degree of certainty. In the QIE you can perform dynamic modification at inspection document level.
You can use the following functions in the QIE:
Description |
Use |
|---|---|
The dynamic modification rule contains the definition of the inspection stages, the dynamic modification time, and the conditions for the inspection stage changes. An inspection stage specifies inspection parameters such as the inspection severity, as well as the probability that an inspection is to be performed. |
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The dynamic modification criteria are key fields that the system uses to update the quality level. |
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The information in the quality level determines which inspection stage will be used for the sample determination of the next inspection document. A quality level belongs to one inspection object type and one fixed combination of properties. |
The quality level represents the current status of the dynamic modification process.
The quality level is always managed based on the dynamic modification criteria that are specified in the inspection rule. You can define the dynamic modification criteria used to manage the quality level with regard to the properties defined in Customizing for the corresponding inspection object type, for example, the material and vendor for goods receipt inspections, or the customer for goods issue inspections.
For the calculation of the inspection scope, the QIE determines the current inspection stage based on the quality level and then determines the inspection specifications accordingly.
At a fixed point in time, the QIE determines the inspection stage for the next inspection document based on the specified dynamic modification criteria and updates the quality level accordingly.
You can fix the quality level in the following ways:
The quality level can be updated in an inspection document on the basis of the dynamic modification valuation after the inspection decision has been made (dynamic modification at inspection decision).
You can update the quality level when the inspection document is created (dynamic modification at inspection document creation). In this case, acceptance decisions for the outstanding document are assumed.
Note
Dynamic modification at inspection document creation is useful if several new inspection documents might be created before you have completed the inspection of the first inspection document.
The conditions for a stage change are defined for each inspection stage in the dynamic modification rule. With the inspection stages, you can vary the probability that an inspection is to be performed between Always Inspect
(100 %) and a Skip
(probability of inspection 0 %) using the inspection probability. The inspection severity can change between a normal, reduced, and tightened inspection. For an inspection according to a sampling scheme, the inspection severity is used to define the sampling table which contains the valid sampling plan.
Note
A skip
means that a certain number of inspection documents are not inspected.
The dynamic modification valuation controls the stage change in the quality level for the corresponding dynamic modification criteria.
A stage change can cause a reduction or increase (tightening) in the inspection scope.
If an inspection decision is reset, the QIE tries to recalculate the quality level. If this is not possible, because new inspection documents have been created after the current inspection document, the system generates a corresponding message for the quality level and for the affected inspection documents.
You have the following options for dynamic modification in the QIE:
How do you want to inspect? |
Dynamic Modification Rule |
Result |
|---|---|---|
Inspect at predefined time intervals |
2 inspection stages: Initial stage: 1x inspection, then switch to skip stage. Skip stage: Inspection probability 0 %, maximum duration of 10 days. |
An inspection takes place every 10 days. |
Inspect a certain percentage of all requests |
1 inspection stage with an inspection probability of 30%. |
30 % of all requests are inspected, 70 % are not inspected. A random generator determines which requests are inspected. |
Inspect every xth request |
2 inspection stages: Initial stage: 1x inspection, then switch to skip stage. Skip stage: Inspection probability 0 %, number of acceptances = 9, then switch back to initial stage. |
Every tenth request is inspected. |
Inspect with sampling schemes |
Three inspection stages: Stage 1 (initial): Inspection severity = tightened Inspection probability = 100 %. Number of acceptances = 3. New inspection stage for reduction = stage 2. Stage 2: Inspection severity = normal. Inspection probability = 100 %. Number of acceptances = 2. New inspection stage for reduction = stage 3. Number of rejections = 1. New inspection stage for tightening = stage 1. Stage 3: Inspection severity = initial. Inspection probability = 0 %. Number of acceptances = 10. New inspection stage for reduction = stage 2. |
3 tightened inspections are performed, followed by 2 normal inspections. Then 10 inspections are skipped. If there are any rejections, the system switches from a normal inspection to a tightened inspection. |
You can combine the different possibilities for dynamic modification listed above.