Design of Experiments Guide  • Covering Arrays • Example of a Covering Array with Factor Level Restrictions
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Example of a Covering Array with Factor Level Restrictions
The following example is patterned after an example described in Dalal and Mallows (1998). An originating phone (Near Phone) calls a receiving phone (Far Phone). Each phone call goes through an interface of type A or B. Five factors are of interest:
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Market: USA, UK, Canada, France, Mexico
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Near Phone: ISDN, Bus (Business), Coin, Res (Residential)
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Near Interface: A or B
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Far Phone: ISDN, Bus (Business), Coin, Res (Residential)
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Far Interface: A or B
You are interested in which combinations of pairs of these factors are likely to cause failures. However, certain combinations are not possible:
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An ISDN line on either phone (Near or Far) cannot use interface A.
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Business and Residential lines on the originating phone (Near) cannot use interface B.

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Help created on 9/19/2017