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our first experience of performing an external replication. In the section that then follows, to categorise various kinds of replication, we present a simple extension to Basili et al.’s (1986) framework for experimentation in software engineering. The penultimate section presents guidance as to the level of reported detail required to enable others perform a replication. In the final section, we conclude that there is only one route for empirical software engineering to follow to make available laboratory packages of experimental materials to facilitate internal and external replications, especially the latter, which have greater confirming power.
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