Unlike pinyin, Cangjie is based on the morphological aspect of the characters wherein each basic, graphical unit is represented by a letter from the Roman alphabet. Within the letters-to-characters representations, there also exists four subsections of characters: the Philisophical Set (comprised of the letters 'A' to 'G' and representing the elements), the Strokes Set (comprised of the letters 'H' to 'N' and representing the brief and subtle strokes), the Body-related Set (comprised of the letters 'O' to 'R' and representing various parts of the human anatomy), and the Shapes Set (comprised of the letters 'S' to 'Y' and representing complex and encompassing character forms).
In order to input using Cangjie, one must be learned in the construction of each character and its basic mnemonics. A lead character serves as an anchor by which other mnemonics will attach themselves to (in most instances these are radicals). For example, in order to enter the character "车" (Che1), meaning "vehicle", one would input 十 田 十 (the second, "Tian2", is based off the Traditional method of writing this character.
See also: Chinese input methods for computer