The Official String Theory Web Site:--> Theatre :--> String Colloquium 7
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Basic Superstring Theory Concepts

. A string's spacetime history is described by the functions Xm(s,t), which map the string's two-dimensional world sheet coordinates (s,t) into the spacetime coordinates Xm.
  the sigma direction
the tau direction A moving string

. Classical string theory dynamics is described by a two-dimensional quantum theory.
The worldsheet action
. Lst is the fundamental string scale which is about 10-32 centimeters. It is also the expansion parameter of this two-dimensional worldsheet theory. Fortunately, this two-dimensional quantum theory is renormalizable.

The Second Superstring Revolution // String Theory: a multihistory

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