Reuse: Empirical Data Siemens(hardware ASICs)reuse study Time to build a reusable component can be 120-150% of time needed to develop component for single use (excludes documentation) For reusuable component, needed to develop new documentation - took one to two times the effort of designing the component Overhead to develop a reusable component(design+ doc recaptured after fifth use Frequency of reuse increases with degree of comprehensibility Habitability even more important: measure of how"at home a potential user of reusable component feels. Highly subjective but effect even greater than that of comprehensibilityCopyright Nancy Leveson, Sept. 1999 Reuse: Empirical Data (2) Siemens (hardware ASICs) reuse study: Time to build a reusable component can be 120-150% of time needed to develop component for single use (excludes documentation). For reusuable component, needed to develop new documentation -- took one to two times the effort of designing the component. Overhead to develop a reusable component (design + doc) c recaptured after fifth use. Frequency of reuse increases with degree of comprehensibility. Habitability even more important: measure of how "at home" a potential user of reusable component feels. Highly subjective but effect even greater than that of comprehensibility. �