In Williams' (2003) systemic approach to analysis and target selection, the parameter of maximal distinction means that the three or four targets selected from a phoneme collapse need to be:

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The parameter of maximal distinction involves selecting targets that are maximally distinct from the child's errors in all aspects of phonological features (place, voice, manner, and linguistic unit) without considering the complexity status, such as whether the sounds are stimulable, marked, or whether they are early or later developing sounds. This approach is based on the idea that targeting phonemes that are very different from the errors can lead to broader generalization and more efficient therapy.

In Williams' (2003) Systemic Approach to Analysis and Target Selection