Absolutely! It is a work in progress.
Turing proposed his famous test in the 50's, and there has been nothing but controversy about it ever since. The controversy is good though -- it forces us to learn more about ourselves and our machines.
The original test was a question and answer session applied to a remote person and a remote machine. If no means could be found of determining which was the person and which was the machine, then the machine would be declared to be "capable of thought".
Here's a good article on the original concept, and a walkthrough of the controversy and developments over the years.