Do Visualizations Improve Program Comprehensibility 做可视化提高程序的可理解性.pptVIP

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Do Visualizations Improve Program Comprehensibility 做可视化提高程序的可理解性.ppt

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The GRASP Research ProjectAn Overview of Program Comprehension Studies Software Visualization Intuitively beneficial in comprehension tasks Empirical evidence is mixed Graphical representations of software are inherently useful, though particular representations may not be. Control Structure Diagram (CSD) Visually depicts the control structure and module-level organization of source code A value-added feature of source code: Appears as a companion to the source code without disrupting its familiar appearance Compact, intuitive, non-disruptive CSD CSD CSD CSD CSD CSD Evaluation Subjective study: performance characteristics Before GRASP was developed and distributed CSD v. similar visualizations rated according to 11 performance characteristics significant preference for the CSD in 8 of 11 Student preference surveys After GRASP was in use in the AU CSSE curriculum Instrumentation 3-4 years of AU utilization data Cumulative implication of these initial evaluations plus anecdotal evidence from industry provided motivation for continued development and study. Empirical Research Two major research objectives Evaluate and refine the CSD (and other visualizations such as architecture diagrams as the research progresses). Study how people use software visualizations in program comprehension tasks. Three major questions to address How do visualizations such as the CSD affect program comprehensibility? How do people use visualization techniques as tools in their work? How can the comprehensibility of a program be measured in an effective way? Funding provided by the National Science Foundation(EIA-9806777). Controlled Experiments CSD v. Plain Text: Round 1 39 senior and graduate level CS students were divided into two performance-balanced groups and given a quiz on a Java module containing 183 source lines of code. One group (the control) was provided the source in plain text only while the second group was provided the source with the CSD. Both groups were asked to