Most people know that the key to success in a long-term relationship is compatibility. But what does that mean? If you both like foreign movies and Mocha ice cream, will you still feel the magic in 25 years?

eHarmony is the only relationship site on the web that creates compatible matches based on 29 dimensions to predict happier, healthier relationships. To help you better understand these 29 dimensions, we've grouped them into Core Traits and Vital Attributes.

Core Traits are defining aspects of who you are that remain largely unchanged throughout your adult life.

Vital Attributes are based on learning and experience, and are more likely to change based on life events and decisions you make as an adult.

These key areas paint a powerful portrait of who you are at the deepest level and form the basis for how our patented Compatibility Matching System ® finds singles that are truly right for you.

	How do you feel about yourself and about the world? While specific day-to-day and moment-to-moment events play a major role in our emotions, deep seated patterns of emotion are also a fundamental part of who you are and how people perceive you. The following members of the 29 Dimensions are considered as part of your Emotional Temperament:
	How do you relate to other people? Do you crave company, or prefer to be alone? Are you more comfortable leading, or do you prefer to go along with the group? Basic feelings such as these comprise an important aspect of who you are, and who you will be most compatible with. The elements of the 29 Dimensions which define your Social Style are:
	How do you think about the world around you? Are you motivated by an insatiable curiosity about the world and events around you? Are you constantly looking for intellectual challenges? Do you find humor to be your favorite coping strategy when dealing with the world? Although Feelings and Social Style can impact on this trait, your Cognitive Mode is an important separate aspect of who you are, and defines a lot of the ways in which you interact with people. The elements of the 29 Dimensions which define your dominant Cognitive Mode are:
	How do you relate physically with the world? How do you relate physically with yourself? Are you energetic, athletic and constantly in motion? Or are you more comfortable and happy walking than running? Feelings and thoughts which revolve around your physical life form an important aspect of who you are. The components of the 29 Dimensions which deal with your Physicality include:
	The amount of effort and skill that you devote to making a relationship work are key elements of who you are, and what type of person you are most likely to succeed with in a relationship. The key attributes that we measure as part of your Relationship Skills are:
	Values and Beliefs are at the center of most of our life experiences. How we feel about spirituality, religion, family and even politics for an enormous part of how we think about the world, and who we are going to be most comfortable sharing our lives with. The following key values and beliefs are included in the 29 Dimensions and form part of your compatibility profile®:
	All of your life experiences combine to affect who you are and how you relate to the world. Although many of the effects of these experiences are represented by the other Core Traits and Learned Attributes, the following components of the 29 Dimensions are considered separately as part of your Key Experiences in your compatibility profile®:

Imagine knowing that you are compatible with someone at this level of depth before you exchange the first email. That's an exciting match! It's also why 90 eHarmony members on average are getting married every single day*.

Let eHarmony help you make sure that the next time you fall in love, it's with the right person.

*Source: Harris Interactive study, Fall 2005.