The document discusses the concept of characterization, or classification, of a cause of action in conflict of laws, emphasizing its significance in legal disputes with foreign elements. It explores various theories of characterization, including lex fori and lex causae, and highlights problems related to renvoi, interpretation of connecting factors, and differing classifications between legal systems, illustrated by notable case laws. The document also outlines different approaches to resolving characterization issues, drawing on the contributions of various jurists and legal scholars.