A cognitive approach to graphic signs and ‘writing’ -- Neil Thomas Cohn

An interesting theoretical framework for tagging 'writing systems'. A prelude  to Visible Language – Inventions of writing in the Ancient Middle East and beyond Edited by  Christopher Woods (2010)
https://oi.uchicago.edu/sites/oi.uchicago.edu/files/uploads/shared/docs/oimp32.pdf 

Kalyanaraman

A cognitive approach to graphic signs and ‘writing’ by Neil Thomas Cohn (May 2005) 61 pages

Source: http://visuallanguagelab.com/P/visualsigns.pdf

https://www.scribd.com/doc/241805122/Visual-Signs