The Dyadic Adjustment Scale (DAS) is a self-reported tool that measures a couples’ satisfaction–how happy they are with each other) and consists of 32 questions. You can click here to download a pdf of the DAS.
The DAS-4 is an abbreviated version of this–so you can complete the form faster!
The 4 alludes to the fact that there are only four items: three of which are on a 6-point Likert scale ranging from 0 (all the time) to 5 (never), while the final item is on a 7-point scale ranging from 0 (extremely happy) to 6 (perfect).
Two articles to read regarding the Dyadic Adjustment Scale are:
Sabourin, S., Valois, P., & Lussier, Y. (2005). Development and validation of a brief version of the Dyadic Adjustment Scale with a nonparametric item analysis model. Psychological Assessment, 17(1), 15-27.
Spanier, G. B. (1976). Measuring dyadic adjustment: New scales for assessing the quality of marriage and similar dyads. Journal of Marriage & the Family, 38(1), 15-28.