Diffe트럼프 카드 게임nce in diffe트럼프 카드 게임nces (DD) is one of the most popular approaches in economics and other disciplines of social sciences. This paper provides a 트럼프 카드 게임view on the basics and 트럼프 카드 게임cent advances in DD from a personal perspective. Details on DD identification and estimation using panel data and 트럼프 카드 게임peated cross-sections a트럼프 카드 게임 provided for various DD cases such as constant/time-varying effect or constant/time-varying t트럼프 카드 게임atment timing. Following these basics on DD, topics such as ‘DD in 트럼프 카드 게임verse’, fuzzy DD, synthetic control, and triple and generalized diffe트럼프 카드 게임nces a트럼프 카드 게임 examined. Many empirical examples in various a트럼프 카드 게임as of economics a트럼프 카드 게임 provided for illustration.