Indus Valley Civilization, one of the ancient civilizations of the world, was Flourishing in the nothern part of Indian sub-continent aroung 3500 Bc - 1500 BC. Ruins of the Cities of this civilaization had been excavated. Remains of this civilization show that this had a heighly developed urban infrastructure. The extend of its spread and the similarity of the towns far apart shows a powerful central control. This would have required an efficient communication system. We all know the importance of written language in effective communication. Unlike other important civilizations of the world, only limited evidence of writing was found here.

Large number of seals, which are beleived as items connected to trade, contain various figures and symbols similar to writing have been found. These are only a few characters long. No seals or any other items have been found to contain bilingual inscriptions. Efforts of archaeologists for several decades, to decipher these writings have not met with success yet. However, according to some epigraphers involved in this effort, although the content in not known, several characteristics of the Language have been established. Following are some of them:

• The writting is from right to left.
• Text contain suffixes. Does not contain prefixes of infixes.
• Indus script belongs to the logo-syllabic type, not to syllabic or alphabetic type.

For any successful attempt to decipher the texts it is important to find out the type of underlaying language. The Indus Valley experts have no agreement in this issue. There are at least four defferent theories put forward in this connection. According to them the Language is:

1. Dravidian.
2. Indo-Aryan
3. Other

As a fourth option a recent theory says the symbols are not a writing system at all.

The experts are still optimistic in deciphering the script in future. They think new archaeological findings will through light on this.