Resumo. ABSTRACTThe aim of this study was i) to compare the results obtained with the Z index (sum of standardized variables)in relation to the classical (Smith, 1936; HAZEL, 1943) and rank sumindexes (Mulamba and MOCK,1978) by means of the growth and wood technology traits and ii) to verify the progeny x environmentinteraction in simultaneous multiple trait selection, based on the Z index. Thus, we used a full sib progenytest ofEucalyptus urophyllaandEucalyptus grandisevaluated in two locations in the municipality of Ipaba,Minas Gerais state. At three years of age, the following traits were evaluated: average yearly increase ofwood, wood density, refined pulp yield and effective alkali. There was good agreement in the progenyselection by the indexes. Thus, use of the Z index of standardized variables is a good option in simultaneousselection of multiple traits in the forestry sector through its ease of application and, above all, interpretationof results. The mentioned index revealed efficient in the study of the genotypes x environments interaction.