Additional Windchill Capabilities > Windchill Aerospace and Defense > Administration and Configuration > Managing Effectivity
  
Managing Effectivity
Windchill Aerospace and Defense configuration management includes the ability to manage effectivity at the configuration level. This allows you to specify the product-level serial numbers for which a design solution is appropriate for a given configuration item.
Windchill Aerospace and Defense configuration management methodology requires the following setup tasks before the configuration management features can be used in production:
1. Create a part for effectivity context.
2. Specify effectivity properties for change directives.
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If you do not want to use the out-of-the-box part subtypes and change objects, you must create part subtypes and change objects and define the appropriate relationship constraints before creating a part for effectivity context and specifying effectivity properties for the change directives.