Similarity in attitudes is a factor affecting attraction in romantic relationships; if two people share similar views and beliefs they will be able to communicate more easily which will help a relationship to form. Similarity of attitudes is the second filter in Kerckhoff and Davis’s filter theory of attraction, and they found similarity of attitudes to be important at the beginning of a relationship and a good predictor of whether a relationship is likely to become stable. They also found that people with dissimilar attitudes are more likely to be ‘filtered out’ from the ‘field of availables’.