  The current critical review aims to be more than a simple summary and
reproduction of previously published work. Many comprehensive reviews and
collections can be found in the literature. The main intention is to provide an
account of the progress made in selected aspects of photoinduced phenomena in
non-crystalline chalcogenides, presenting the current understanding of the
mechanisms underlying such effects. An essential motive for the present review
article has been to assess critically published experimental work in the field.
