  In an effort to understand the glass transition, the dynamics of a
non-randomly frustrated spin model has been analyzed. The phenomenology of the
spin model is similar to that of a supercooled liquid undergoing the glass
transition. The slow dynamics can be associated with the presence of extended
string-like structures which demarcate regions of fast spin flips. An
entropy-vanishing transition, with the string density as the order parameter,
is related to the observed glass transition in the spin model.
