This article introduces the Iranian Couples Interaction Coding System (ICICS), which is an observational method for evaluating the quality of couple's interactions. The coding system was based on the Specific Affect Coding System. Problem-solving, decision making and reviewing conversation about a shared pleasure event in the past interactions of 31 distressed and non-distressed couples were videotaped. Findings showed that the ICICS is a reliable and valid measure of Iranian couples' interactions.Results from this study reveal an association to exist between ICICS and marital satisfaction; i.e. the higher the positive interaction of couples in the ICICS, the more the marital satisfaction is. Results of the discriminant analysis also show that ICICS can predict marital satisfaction and dissatisfaction with high degree of accuracy using the positive and negative interacttions.The ICICS has 23 codes: 15 negative codes, 1 code for neutral affect, and 7 positive codes for each person to assess the verbal and nonverbal behaviors of both speakers and listeners.11 co-des out of 15 negative codes are similar to other coding systems ("Disgust", "Contempt", "Belligerence", "Domineering", Criticism", "Anger", "Tension", "Tense Humor", "Defensive-ness", "Sadness", and "Stonewalling"). However, several categories were introduced into the ICICS which either have not been reported in previous (Western) studies, or have not been considered of importance to be in a different code or category. For instance, quality of communication about "Family-of-Origin" plays a very important role in distinguishing between distressed and non-distressed Iranian couples. Other codes that were added to this system include “Family Contempt”; such as “Contempt, Criticize, Disagreement and Disputing toward each other families”, “Contempt toward her/him self”, “Condemning the Relationship”, and “Gender Rules”. Positive codes include positive codes in other coding systems as well as using "We" to talk about couples as a unit in their relationship. This study highlights the importance of cultural components, especially the importance of family ties, in Iran.