Spectrum: A spectrum is a range of different types or a continuous series of values, as in the electromagnetic spectrum or the autism spectrum.
Dimensional Approach: The dimensional approach to psychological disorders views them as existing on a continuum, with normal and abnormal behaviors representing different points along the same dimension.
Categorical Approach: The categorical approach to psychological disorders views them as distinct, separate conditions that either are present or absent, with clear boundaries between normal and abnormal behavior.