Newly Compiled Direct Guide to the General Source of Computational Methods

original: "新編直指算法統宗" (Xinbian zhizhi suanfa tongzong). This 1592 work by the mathematician Cheng Dawei is the most famous and influential text on the use of the suanpan (the Chinese abacus). It standardized calculation methods for centuries across East Asia.

The phrase "Direct Guide" (直指) suggests a straightforward, instructional approach intended for practical use by merchants and officials, rather than just abstract theorists.