This area complements the Initial Planning stage, in that it defines standards for confirming that the actual performance of the PAM system is consistent with the assumptions and predictions made in the planning stage. Basically, is the system able to achieve the detection range required for the marine mammal species in question? Some aspects of performance validation take place during the fieldwork; these include measurements of the self-noise of the electronics of the system during the survey, and recording spectra of the background noise levels of the towed system under various circumstances. Other aspects take place after fieldwork, such as requiring any summary of the PAM operation to document certain performance metrics, and specifying units and formatting for plots depicting these metrics. It may seem strange that a PAM standard would recommend how to format a plot for a report, but imposing some standards on how PAM summary measurements are presented will facilitate comparisons between different surveys, and aid regulators and independent reviewers in evaluating the adequacy of the operation.