Cook Cook, Vivian J. and Bassetti, Benedetta (eds) studies about “Second Language Writing Systems. Clevedon, UK: Multilingual Matters” Writing systems supersede the flow of spoken language as an order of divergent linguistic units with clear confines. A relatively smaller amount of research shows that learners and users of a second language writing system (L2WS) also have a different knowledge of the linguistic units superseded by their L2WS, compared with its native users. Native users of different writing systems are affected in their analysis of the spoken language by the linguistic units that their writing system supersedes as separable units (by means of graphemes and orthographic conventions). When they learn a second language, they may encounter a L2 writing system that supersedes different linguistic units as dislocate units. In that case, these multi-competent L2WS users may develop a different knowledge of the linguistic units in their second language compared with native users of the objective language because they know more than one writing system.