• Criterion_i: These classes represent each one of the alternative abstraction criteria of the TargetDomainConcept (Criterion1, Criterion2, Criterion_i in the Figure above). The list of classes may not be exhaustive or pairwise disjoint.

• Ci_Class_x: These classes refine each abstraction criteria class (C1_Class1, ..., C2_Class1, ..., Ci_Class_i in the Figure above). The list of classes may not be exhaustive or pairwise disjoint.

• CiClass_xCjClass_y, Ci_Class_xClass_y: These classes participate in multiple inheritance relationships combining different refinements from the alternative abstraction criteria classes (C1Class3_C2Class2 and C1_Class1Class2 in the Figure above).

[1] Avizienis, A., Laprie, J.C., Randell, B., Landwehr, C.: Basic concepts and taxonomy of dependable and secure computing. IEEE Transactions on Dependable and Secure Computing 01(1) (2004) 11--33

• A first criterion can be derived from the left column of the matrix (listing the basic view points from Figure 2: Development/Operational Faults, Internal/External Faults and so on). This column represents the values of the eight basic viewpoints which lead to the elementary fault classes.
• A second criterion can be abstracted from the bottom row (listing numbers 1 to 31). This row represents the 31 likely combinations of fault classes out of the 256 possible.
• A third criterion is implicit at the top row, representing the three major partially overlapping groupings of faults: Development, Physical and Interaction.
• A fourth criterion can be seen at the bottom row, labeled Examples, containing nine illustrative examples of fault classes.