This work presents a systematic process of deciphering the Indus script.
Detailed comparisons between Sumerian and Indus languages (specially Marthi, Malvi, Nimadi, Rajasthani, and Gujarati) and Karen clearly prove that ages back, Indo -Tibetan family languages prevailed from Sumer in present-day Iraq to the Narmada River area in India.
After comparing the vocabulary, I drew a chart of roots and words. Indus script has many pictographs. I applied phonetic values to the Indus scripts.
A language is defined by its syntax, semantics, and phonetics. The syntax defines the set of valid sequences of symbols in that language.
The set of rules used to generate these valid sequences of symbols is called grammar. The test of decipherment is whether it is semantic and does it convey meaning.