Abstract: The present invention relates to methods for generating functional biomolecules. In one exemplary aspect of the invention, generation of functional biomolecules may be performed against multiple targets simultaneously within a single system. In general, a plurality of targets may be disposed within in a single reaction volume and a library of biomolecules, such as a nucleic acid library, may be applied to the reaction volume. The members of the library that do not bind to any of the plurality of targets under given conditions may then be partitioned. The remaining members of the library may then be marked and/or tagged, such as to identify the particular target or targets to which the member of the library binds. The binding members of the library may then be isolated and, by virtue of the marking or tagging, be matched to a particular target or targets.