It is well-known that wh-pronouns may pied-pipe their containing host phrases as they move to their final scope positions. In Finnish, such pied-piping requires further that a wh-element is situated at the left edge of host phrases, a position in which it ends up either through base generation or through wh-movement. This article investigates which independent properties define such pied-piping domains. An empirical generalization will be defended according to which a phrase constitutes such pied-piping domain if and only if it is adjoinable. The hypothesis that pied-piping domains are islands is put into question. Secondary wh-movement, pied-piping and adjunction are thus intrinsically linked with each other.
