This symposium paper (650 Kb PDF) reviews the main areas of concern with regard to movement and gives guidance on how such movement can be accommodated within modern masonry construction.
All building materials 'move' in use, for a variety of reasons. The four main causes of movement are loading, chemical action, thermal and moisture movement. The last two are, by far and away, the most important with reference to the use of masonry in modern building construction.
The guidance is based upon British Standard Codes of Practice and information published by both trade organisations and manufacturers.