Speech has two aspects, knowledge (phonology) and expression (articulation).
Assessment of these Error Patterns by either spontaneous sample speech or single word test is a g.
These Patterns may be normal or unusual, and are classified as syllable structure, substitution and assimilation Error patterns.
During the development of phonology, children make systematic errors, targeting certain Phonological element classes, called Phonological Error Patterns which later on are modified and suppressed.
Speech has two aspects, knowledge (phonology) and expression (articulation)