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The overall process for extending metadata is as follows:

Adding Fields from the CDASH Model

1. Using the root variables and other CDASH metadata in the CDASH Model, add any additional variables that are needed to meet the requirements of data collection.

   1. Refer to both the CDASH Model and Appendix x, CDASH Model Metadata Tables.

   2. Follow Appendix x, CDISC Variable-naming Fragments, conventions, and CDASH CDASH root variable-naming conventions where they exist (e.g., --DAT for dates, --TIM for times, --YN for prompts, as described in the CDASH Model) . and Appendix x, CDISC Variable-naming Fragments, conventions, and 

Creating New Fields

When creating a new data collection field, determine whether the data will be used for an operational use case, such as data cleaning, or are actual data to be represented in a tabulation dataset. In general, new data collection fields (not already defined in the CDASH Model) will fall in one of following categories:

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