Tests & Systems
Here you will find resources that help couples (and their coaches and therapists) understand the relationship itself more thoroughly. There are also many personality and preference tests for individuals which, when shared with a partner, can foster understanding and connection. Look for those in section 2.
Understanding Each Other
It can be useful for the individuals within a partnership to take preference, aptitude, or personality tests and discuss the results in order to understand each other better. Here are some of the most useful.