Recording quotations inaccurately and arguing your case on the basis of erroneous information are unethical and unprofessional practices and they can certainly undermine the argument you hoped to support by using quotations.
Use quotations when another writer's language is so clear and economical that to make the same point in your own words would, by comparison, be ineffective.
This is largely a matter of personal or corporate style: there is no rule concerning the correct length of an introduction. It requires a training such as the athletes underwent Read the following paragraphs from Robert Jastrow's "Toward an Intelligence Beyond Man's": These are amiable qualities for the computer; it imitates life like an electronic monkey.
Such was the case in the village of My Lai, Vietnam, on March 16,when a platoon of American soldiers commanded by Lt. The more ambitious the thesis, the more complex will be the paper and the greater will be the readers' expectations.
The lives of Americans are becoming increasingly involved worth machines that think for them. This next conclusion comes from a sociological report on the placement of elderly men and women in nursing homes.
The brackets indicate to the reader a word or phrase that does not appear in the original passage but that you have inserted to avoid confusion. Because you haven't written a paper based on any of them, they remain hypotheses to be tested. Arthur Samuel made this discovery when he taught two IBM computers how to play checkers.