Download - Constructing Excellence

Dealing with ‘Flat’ Sections on GraphsA number of KPI graphs have sections where the performance line runs horizontally. This is becausethe underlying data set contains a relatively large number of results of the same value.To achieve a correct benchmark score in these cases, follow these steps with reference to theillustration below (see Figure 7):1 Plot the measured benchmark score on the vertical axis (1).2 Read across to the graph line (2).3 If the graph line is intersected at a ‘flat’ zone, follow the graph line to the lastpoint of contact at the end of the flat section (3).4 Read down to the horizontal axis (4). This is the company/project benchmarkscore out of 100%.PerformanceChange between estimated and actual costCost DecreaseCost Increase-30%-20%-10%0%+10%+20%Predictability - CostDesign costConstruction cost1 2 3+30%0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%Benchmark ScoreFigure 7: KPI graph - reading a graph with flat sections4In the example (see Figure 7) a company wishes to benchmark its predictability of cost of design.It has delivered on cost, achieving a performance of 0% which equates to a benchmark score of76%. This means that 76% of projects performed equal to or worse than the example (i.e. theywere on or above cost), and 24% achieved a better performance than the example (i.e. theywere below the estimated cost).162006 UK KPIs - Handbook