The best known non-literate reinvention of writing is that of the Cherokee script, developed by Sequoyah in 1821 and used by Cherokee speakers continuously to this day. However the Vai script of Liberia, created in ca. 1833 is a much stronger candidate for comparative analysis for a number of reasons: a) it did not take the form of an existing script as a model as Cherokee did with the Roman script; b) its mode of transmission has remained informal over its history (no schools or institutions); c) campaigns to standardise the script have occurred much later in its development; d) and it has been independently documented on fifteen separate occasions between 1834 and 1981 meaning that its full history is adequately known and does not require any interpretive reconstruction.