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\section{Interlude: The Cost of Defects}  (Defect Prevention: Reducing costs and enhancing quality)     Data to support the need for early fixes of software defects is supplied by several reports.     The NIST published a study in 2002 noting that the cost of fixing one bug found in the production stage is 15 hours compared to 5 hours of effort if the same bug where found in the coding stage.     (The Economic Impacts of Inadequate Infrastructure for Software Testing --- NIST)     Table 1.5. Relative costs to repair defects when found at different stages of the life-cycle.     Figure 5.3. Software testing costs shown by where bugs are detected.     Figure 5.4. Cost reductions of detecting bugs and fixing them faster.     Table 6.3. Hours to fix bug based on introduction point.