1. Take the impact rating and select correct column;
  2. Take the likelihood rating and select correct row;
  3. Use the risk score where the two ratings cross on the matrix. Risk Assessment Matrix is a table with Impact across the top labelling the columns, and Likelihood across the left labelling the rows. There are five columns (impact): Insignificant (1); Minor (2); Moderate (3); Major (4); and Extreme (5). There are five rows (likelihood): Almost Certain (A); Likely (B); Possible (C); Unlikely (D); Rare (E). As each column and row intersect, a risk rating of either Very High, High, Medium, or Low is provided. The risk ratings are: A5 - Very High; A4 - Very High; A3 - High; A2 - High; A1 - Medium; B5 - Very High; B4 - High; B3 - High; B2 - Medium; B1 - Low; C5 - High; C4 - High; C3 - Medium; C2 - Medium; C1 - Low; D5 - Medium; D4 - Medium; D3 - Medium; D2 - Low; D1 - Low; E5 - Medium; E4 - Medium; E3 - Low; E2 - Low; E1 - Low.