  One of the most spectacular phenomena in physics in terms of dynamical range
is the glass transition and the associated slowing down of flow and relaxation
with decreasing temperature. That it occurs in many different liquids seems to
call for a "universal" theory. In this article, we review one such theoretical
approach which is based on the concept of "frustration". Frustration in this
context describes an incompatibility between extension of the locally preferred
order in a liquid and tiling of the whole space. We provide a critical
assessment of what has been achieved within this approach and we discuss the
relation with other theories of the glass transition.
