Does your wife wear soiled aprons around the house? That's a demerit. Is she slow in coming to bed? That's another demerit. She's not turning out too well.
In the 1930s, psychologist George Crane developed ratings charts that husbands and wives could use to offer each other constructive criticism:
Although most people who read the test today find it humorous and obviously dated, Crane did attempt to make it scientific. His method was to interview 600 husbands on their wives' positive and negative qualities. Then he listed the 50 demerits and merits that arose most frequently. Crane, did admit to using a personal bias in weighting the items that he thought were most important in marriage.
You can view the chart for husbands at the link.
Link via Glenn Reynolds