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“concentration  so  intense”:  from  page  71  of  Csikszentmihalyi,  Mihaly.  Flow:  The
Psychology of Optimal Experience. New York: Harper & Row Publishers, 1990.
“Five years of reporting”: from page 13 of Gallagher, Rapt.
“I’ll choose my targets with care”: Ibid., 14.
A Psychological Argument for Depth
For more on the experience sampling method, read the original article here:
Larson,  Reed,  and  Mihaly  Csikszentmihalyi.  “The  Experience  Sampling  Method.”
New Directions for Methodology of Social & Behavioral Science. 15 (1983): 41-
56.

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You  can  also  find  a  short  summary  of  the  technique  at  Wikipedia:
http://en.wikipedia.org/wiki/Experience_sampling_method.