Interpolation of T/C levels
Nowadays most maps are made using monopolar stimulation, which has the advantage that there is less current needed and that the T and C levels across the array show less variation. The apparent disadvantage of less localized (i.e. less selective with respect to frequency) stimulation is not found clinically.
The smooth appearance of T and C level curves in monopolar mode has led to the rise of interpolating techniques: When using interpolation the clinician does not measure every single electrode but measures a subset and uses interpolated values for the intermediate (not-measured) electrodes.
It has now become almost standard to use interpolation between every second electrode for both T- and C-levels, often followed by the usual full array loudness-balancing sweep. Some clinicians use even wider interpolation.
This method can be used equally well in children and adults. In children the balancing is often not possible, but looking for signs of discomfort while sweeping along the array at least rules out the possibility of over-stimulation.
Advantage:  Saves time
Disadvantage: In some cases the interpolated levels could deviate from the true T and C levels, may not be accurate enough for some.
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