One of the purported uses of "Word Clouds" in Tableau 8 is to visualise responses say, from free text fields in surveys. A number of Tableau demo videos I've seen have alluded to this or indicated it as an application but provided no further instructions.

Is this something that can be implemented using a calculated field or does the data need to be manipulated before you can create it?

My data consists of a row for each survey respondent with one field that is a free text response to the question. There are additional columns with demographic data and dimensions.