Your priest doesn’t seem to have an accurate understanding of what the FOCCUS inventory is really about. I’m not surprised that he “didn’t feel that it was an accurate assessment of the compatibility of two people,” because that’s not what it’s designed to be. So, on the one hand, it’s kind of unfortunate that your parish doesn’t use it – but maybe it’s for the best if the priest has such a basic misunderstanding of its purpose. At least he’s not misusing it with engaged couples.
The FOCCUS is an inventory, not a “test.” Both use questions or statements (on FOCCUS it’s statements) to measure something, but tests generally are pegged to a scoring scale with cutoff points where you have “passing” and “failing” scores, and the FOCCUS doesn’t work like that. There’s no magic number you need to earn to prove you’re compatible, or anything like that.
Inventories have questions/statements related to different categories/areas. They touch on various topics (spirituality, ethics, communication, family relationships, sex, finances, children, to name a few that come up on the FOCCUS) to try to get a picture of each partner’s attitudes about those topics, and to identify areas where they are closely aligned and areas where they have differences. (Every couple has areas of closer alignment and greater divergence). The second part of the FOCCUS process is to go through the statements with a facilitator (at our parish it was a married couple, which I think was better in many ways than going through it with a priest. They had examples and anecdotes from their own experience that helped shed light on what some of the statements were aiming at.) The larger purpose is to simply make sure that, ahead of getting married, you and FI have a chance to really talk through some of these very important topics that can be awkward to discuss (and therefore sometimes people tend to avoid talking about them at all, or they make a lot of assumptions about their partner’s attitude, both of which are not smart strategies for marriage preparation.)
Some examples of things you might see on the FOCCUS are, “It is important to me that our children be baptized in the Catholic Church.” or “My partner and I have discussed finances and how much debt we will have when we marry.” or “Sometimes my partner gets so angry that I fear for my safety.” or “I often worry about my partner’s drug or alcohol use.” The options would be “Agree,” “Disagree,” and “Not Sure.” (Obviously there is a “preferred” answer for many of the questions – not a “right” answer, per se, but an answer the Church would like to see couples agree on). In a marriage between a Catholic and a non-Catholic, for example, the non-Catholic might well answer “Disagree” or “Not Sure” to the baptism statement. Well, then you would spend some time in your session discussing your feelings about it. You may or may not come to any conclusions, you may or may not agree to have your children baptized – and that’s fine. At least you will have discussed it, and not gone into marriage without at least beginning to address it.
So, that’s what FOCCUS is supposed to do. It’s a tool for knowing yourselves better as a couple and opening up communication on challenging issues, not a “compatibility assessment” as your priest seems to think.