The article by de Groot and Steg (2008) explores the value orientations that explain beliefs and intentions related to environmentally significant behavior (ESB). The authors argue that three distinct value orientations—egoistic, altruistic, and biospheric—can be empirically distinguished and are relevant for understanding environmental beliefs and intentions. They propose a new value instrument to measure these orientations and report results from three studies to validate its reliability and validity. The studies show that the value instrument successfully distinguishes between egoistic, altruistic, and biospheric value orientations, with high internal consistency and explained variances. The value orientations are differently related to general and specific beliefs and intentions related to ESB. Specifically, egoistic values are negatively related to environmental concern, while altruistic and biospheric values are positively related. Altruistic and biospheric values also contribute uniquely to the explanation of specific beliefs and intentions, such as attitudes toward recycling and donating intentions. The findings suggest that altruistic and biospheric values provide a distinct basis for proenvironmental intentions when they conflict. The value instrument is useful for understanding the relationships between values, beliefs, and intentions related to ESB, particularly when altruistic and biospheric goals conflict. However, further validation is needed to clarify which value orientations are most strongly related to environmental beliefs and intentions in specific situations.The article by de Groot and Steg (2008) explores the value orientations that explain beliefs and intentions related to environmentally significant behavior (ESB). The authors argue that three distinct value orientations—egoistic, altruistic, and biospheric—can be empirically distinguished and are relevant for understanding environmental beliefs and intentions. They propose a new value instrument to measure these orientations and report results from three studies to validate its reliability and validity. The studies show that the value instrument successfully distinguishes between egoistic, altruistic, and biospheric value orientations, with high internal consistency and explained variances. The value orientations are differently related to general and specific beliefs and intentions related to ESB. Specifically, egoistic values are negatively related to environmental concern, while altruistic and biospheric values are positively related. Altruistic and biospheric values also contribute uniquely to the explanation of specific beliefs and intentions, such as attitudes toward recycling and donating intentions. The findings suggest that altruistic and biospheric values provide a distinct basis for proenvironmental intentions when they conflict. The value instrument is useful for understanding the relationships between values, beliefs, and intentions related to ESB, particularly when altruistic and biospheric goals conflict. However, further validation is needed to clarify which value orientations are most strongly related to environmental beliefs and intentions in specific situations.