Reading the Matrix

Each row is one part of the problem, each column also represents a part of the problem. The resulting matrix is symmetrical, so that the intersection of matching rows and columns points to the same parts of the problem. Hence the diagonal is where the matching row meets its column.

The intersection of a row and column represents a relationship.

For example, row 2 '2! Pressure at rear...' has a mark of Zero at column 3 '3! Brake torque...'.

A mark for a row in a column means that the column is a prerequisite for the row.