To measure the response style of acquiescence, researchers recommend the use of at least 15 items with heterogeneous content. Such an approach is consistent with its theoretical definition and is a substantial improvement over traditional methods. Nevertheless, measurement of acquiescence can be enhanced by two additional considerations: first, to ensure that it is not confounded with item valence, equal numbers of positively and negatively phrased items should be used; second, the validity of acquiescence scores can be substantially improved when derived from more than 15 items: about twice that number appears to be the minimum. These issues are illustrated empirically and recommendations are made for research practice.