Samenvatting
This study quantifies and analyzes the major components associated with the gas station provision of air pressure services. These components can be divided into two groups: those associated with the provision of air --whether an air pump is present, whether it works and whether a fee is charged for its use-- and those associated with the measurement of air pressure --whether a gauge is present and, if so, how accurately it performs its task. Hence, this study has been divided into five parts: pump availability; pump functionality; gauge availability; gauge accuracy; and pump fees. (A)