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|  | **TestLen** | **BYTE, PROTECTED** |

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The **TestLen **property contains the length of the Root property. For example, if the step bounds are 'abbey' and 'abracadabra' then Root contains 'ab'. The related property TestLen is equal to the length of Root, that is, 2.

The Init method sets the value of the TestLen property.

**Implementation:**

The GetPercentile and GetValue methods use the Root and TestLen properties to efficiently traverse the defined steps.

The value of the TestLen property depends on the value of the LookupMode property. LookupMode of U.S. surnames uses TestLen of 3, English alphabet uses TestLen of 2, and runtime data distribution uses TestLen of 4.

**See Also:**     [[init  initialize the stepstringclass object .htm|Init]], [[lookupmode  expected data distribution .htm|LookupMode]], [[root  the static portion of the step .htm|Root]]