  Over the last decades, a considerable amount of empirical knowledge about the
efficiency of defect-detection techniques has been accumulated. Also a few
surveys have summarised those studies with different focuses, usually for a
specific type of technique. This work reviews the results of empirical studies
and associates them with a model of software quality economics. This allows a
better comparison of the different techniques and supports the application of
the model in practice as several parameters can be approximated with typical
average values. The main contributions are the provision of average values of
several interesting quantities w.r.t. defect detection and the identification
of areas that need further research because of the limited knowledge available.
