Four Themes in the Life of a TCK
Change: TCKs learn to become comfortable with change. This can be a benefit -- adaptability and flexibility -- but it can also become a hindrance, as many TCKs appear generally non-committal or have difficulty keeping jobs or maintaining long-term relationships as adults.
Relationships: TCKs typically have the experience of making and losing friends quickly. Because of this, Schaetti and Ramsey note, "Both the ability to make friends and the tendency to enforce a certain distance are global nomad survival skills."
World View: International understanding is among the best results of the Third-Culture experience. TCKs recognize that what happens in one country has an impact on what happens in other countries; they have a sense that coutnries of the world are connected. In fact, many TCKs go on to have careers in diplomacy or international relations.
Cultural Identity: TCKs experience the influcence of two (or more) cultures throughout their lives. They often feel like outsiders in the country that is supposed to be "home," even when it comes to seeminly small differences.
The above info was taken from the following site: http://www.girlscouts.org/for_adults/leader_magazine/2004_winter/third_culture_kids.asp