The present invention relates to methods for obtaining positive transformants of a filamentous fungal host cell, comprising: transforming a tandem construct into a population of cells of the filamentous fungal host a tandem construct and isolating a transformant of the filamentous fungal host cell comprising the tandem construct. The present invention also relates to such tandem constructs, filamentous fungal host cells comprising such tandem constructs, and methods of producing multiple recombinant proteins.