Other matrices besides 3 × 3 or 5 × 5 can be utilized; however, matrices with more than five levels can requiresignificantly more data to be able to meaningfully distinguish between the various levels. Rationales for theselection of matrices and their outcome scores should be documented. Note that matrices with three levelsmight not always be sufficiently accurate for adequate decision making. While the above examples were 3 × 3and 5 × 5, there is no need that these matrices be balanced. For example, a 4 × 5 matrix could be appropriatefor a given application.