This document defines the methods for the generation and testing of foamed cement slurries and their corresponding unfoamed base cement slurries at atmospheric pressure. These methods are developed for foamed cement slurries with air, at atmospheric conditions, which could mimic a foam quality experienced with nitrogen at downhole conditions and which can be modified to accommodate other gases such as nitrogen. This document also addresses slurries that are foamed with nitrogen including their properties. This document does not address testing at pressures above atmospheric conditions and does not include or consider the effects of nitrogen solubility in the nitrogen fraction calculations. This document is a supplement to API RP 10B-4, 2nd edition (2015), the requirements of which are applicable with the additions and exclusions specified in this document.