Derivational forms are compositionally constructed out of stems and affixes. It is helpful, however, to distinguish between the Immediate Dominance, ID, aspect of composition of stems and derivational categores at a more general level, on the one hand, and the temporal relations of Quasi-Linear Precedence which realise these constructs, i.e. make them pronounceable.
The QLP relations (which may also be expressed as operations) involved in realising derivational structures are: