As defined by ASME Y14.24, a Selected Item Drawing does exactly what its name says: it selects certain as-built items from a production stream, rejecting others. This drawing type is identifying because the parts meeting its acceptance criteria are no longer interchangeable with any other parts for the purposes that caused the selected item drawing to be created.
This type of drawing never adds features to a design. It simply screens them into piles relative to what we want. For example, this is how many CPU’s are separated into different pricing “bins”: i7 CPU’s coming from a single product line can be segregated into fast (K-series, high peak power draw), medium (S-series, moderate peak power draw), and slow (T-series, low peak power draw). The drawing that marks them would be considered a selected item drawing.
Contrast with Altered Item Drawing. See also the CI Development Cycle (Intermediate).
This fact of this drawing type’s existence is actually all that is needed to substantiate the assertion that the acceptance criteria are “…part of the design…”.