In the test plan editor, attributes are site-specific characteristics that you can define for your test plan and assign to test descriptions and group descriptions. Each attribute has a set of values. For example, you define the Developer attribute and assign it the values of Kate, Ned, Paul, and Susan, the names of the QA engineers in your department.
Attributes are useful for grouping tests, in that you can run or report on parts of the test plan that have a given attribute value. For example, all tests that were developed by Bob can be executed as a group.
In Silk Test Classic, an attribute is a characteristic of an application that you verify in a test case. Attributes are used in the Verify Window dialog box, which is available only for projects or scripts that use the Classic Agent.