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When software developers want to understand the reason for a program's behavior, they must translate their questions about the behavior into a series of questions about code, speculating about the causes in the process. The Whyline is a new kind of debugging tool that avoids such speculation by instead enabling developers to select a question about program output from a set of why did and why didn't questions derived from the program's code and execution. The tool then finds one or moredoi:10.1145/1368088.1368130 dblp:conf/icse/KoM08 fatcat:z4wtb63r2bcvbayzzbbcrs5rda