… diacritic symbols such as acute accent for high tone and grave
    accent for low tone …
  
    All too often, tone orthographies are established by fiat and
    defended by anecdote. Whether or not tone is marked, the most
    frequently cited justifications offered by the designers are either
    linguistic analysis, or socio-political factors, or an
    impressionistic evaluation that ‘we tried it and it seemed to work
    fine’. This article presents objective evidence that an existing
    tone orthography for an African tone language actually hinders
    fluent reading and writing.