stückchenweise

Etymology
From.

Adverb

 * 1) in bits and pieces, in a piecemeal fashion, piecewise, piece by piece, little by little, bit by bit, by the slice

Adjective

 * 1) piecemeal, piece-by-piece

Usage notes
Since stückchenweise is originally an adverb, its use as an adjective is still frowned upon by some, although it has become common in contemporary German.