Interest

A Sims interests are randomly generated when created or at birth. There are 18 interests. They can be found on the simology panel in-game. The more points in an interest, the more interested a sim is in the particular subject. The interests that have the highest scores are the ones a sim will usually talk about when they initiate a conversation or be interested when being talked to. For the most lengthy and constructive conversations its best to talk to sims that have similar interests.

Interests can be changing two ways:
 * Magazines
 * "Share Interests" Social Interaction

Interests are unlike personality points when you increase them. It is impossible to have 10 in every single interest because once you increase an interest by one point another one will decrease by 1 point.