Moodlets
The mood system in The Sims 3 uses an easy-to-read system of moodlets that instantly show all of the contributing factors to your Sim’s overall mood. Use these moodlets to direct your household and make adjustments to behaviors, activities, or objects. If a Sim is Disgusted, look around for something unpleasant like dirty dishes or rotten leftovers. However, if you note that your Sims are happy about getting a compliment from a smooth Sim (the Flattered moodlet), then make sure they talk to that Sim more often for a good ego-stroke.
Here are three lists of all of the moodlets your Sims might experience during their lives. Each moodlet entry lists the effect on the overall mood and the duration of the effect. Most moodlets are self-explanatory. As you explore the careers, skills, socials, relationships, and objects sections of this guide, you’ll find examples of how to generate these moodlets—and how to potentially avoid the bad ones.