section_path: History/Regular script
section_name: Regular script
paragraph_text: Regular script
  
  Regular script (楷书; 楷書; kǎishū), based on clerical and semi-cursive forms, is the predominant form in which characters are written and printed. Its innovations have traditionally been credited to the calligrapher Zhong Yao (c. 151 – 230), who was living in the state of Cao Wei (220–266); he is often called the "father of regular script". The earliest surviving writing in regular script comprises copies of Zhong Yao's work, including at least one copy by Wang Xizhi. Characteristics of regular script include the ' pause ' (頓; dùn) technique used to end horizontal strokes, as well as heavy tails on diagonal strokes made going down and to the right. It developed further during the Eastern Jin (317–420) in the hands of Wang Xizhi and his son Wang Xianzhi (344–386). However, most Jin-era writers continued to use neo-clerical and semi-cursive styles in their daily writing. It was not until the Northern and Southern period (420–589) that regular script became the predominant form. The system of imperial examinations for the civil service established during the Sui dynasty (581–618) required test takers to write in Literary Chinese using regular script, which contributed to the prevalence of both throughout later Chinese history.