The construct of “Constant and Never-ending Improvement” (CANI)
popularized by Robbins (1997) represents a growth orientation—the
personal quality of ever striving to improve. While this concept has
not been explored in relationship research particularly in the area
of couple similarity, a related construct—need for achievement has
been found to be a robust predictor of marital satisfaction; however,
spouses showed little similarity on this quality (MacEwen & Barling,
1993).