The Yuanshi shifan 袁氏世範 "Models for the world by Master Yuan" is a Neo-Confucian treatise written by the Southern Song period 南宋 (1127-1279) scholar Yuan Cai 袁采 (dates not clear). Yuan Cai's administrative handbooks Zhenghe zazhi 政和雜志 and Xianling xiaolu 縣令小錄 are unfortunately lost. The original title of his Confucian treatise was Xunsu 訓俗 "Instructions for the commoner", but it was changed by Liu Zhen 劉鎮, who has written a preface to it, to Shifan "Models for the world". The Shifan uses a very simple, but easy-to-read and easily understandable language to explain the social hierarchies as a naturally created system.
There is a print by the Ming period 明 (1368-1644) scholar Chen Jiru 陳繼儒 in his collectaneum Baoyantang miji 寶顏堂秘笈, but it contains many errors. The best version is included in the encyclopedia Yongle dadian 永樂大典.
Source: Li Xueqin 李學勤, Lü Wenyu 呂文鬰 (1996). Siku da cidian 四庫大辭典, vol. 2, p. 1552. Changchun: Jilin daxue chubanshe.