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Once you have chosen to provide a list of values for a segment, you choose whether to use independent, dependent, or table validation. You would only use a dependent set if you want your segment values to depend upon the value chosen in a prior independent segment (a segment that uses an independent value set). Whether you use an independent or table set depends on where you intend to get your values. If you already have suitable values in an existing table, you should choose a table set. If you were to use an independent set and you already maintain those values in an application table, you would need to perform double maintenance on your values. For example, if you need to disable an invalid value, you would need to disable it in both the Segment Values window (for your value set) and in your application form that maintains your existing table (for use by your application). If you do not already have a suitable table, you should probably use an independent set and maintain your values using the Segment Values window.
Planning Values and Value Sets
Defining Values and Value Sets
Choosing a Validation Type for Your Value Set
Plan Values to Use Range Features
Defining Hierarchy and Qualifiers Information
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