*Some errors having chance of giving huge loss may don't get highlighted because of less occurrence. Example: In automobile industry Brake issue giving severe loss may don't get highlighted as it occurred less * Pareto may show less impact defect as important one just because its multiple occurrence. Example: Pareto may highlight seat cover defect which has less impact * Same kind errors may classified as different which lead to miscalculation. Example: If Seat and seat cover defect calculated separate it lead to miscalculation