how efficient were words alone in expressing ideas

Answer 1

communication in using email or share information

Answer 2

The more similar the backgrounds of the writer and reader, the more likely that they will interpret words in the same way — and the more likely that words alone will be more effective. The most basic similarity is that they both speak the same language.

The writer needs to make sure that s/he is saying what s/he wants to say. For example, is "were" in your question a typo, or do you really mean to use the past tense?

The reason I speak solely about writing is that oral communication (speaking and listening) — even on a telephone — involves variations in volume, tone and rate of speaking that influence the meaning of the words used.

One test of the understanding of what was said is to have the reader respond in their own words to indicate their understanding of what was said (feedback). Asking "Do you understand?" will almost always get and affirmative response ("Yes"), whether the reader understands or not.

These articles might help you understand a little more:

http://www.members.cox.net/dagershaw/lol/communicationDepths.html
http://www.members.cox.net/dagershaw/lol/MessageAcross.html

I hope this helps. Thanks for asking.