Laboratory studies evaluated the sensitivity of Sinella curviseta Brook (Collembola: Entomobryidae) to selected heavy metals (Cu, Pb and Zn). Survival, reproduction and growth of S. curviseta were determined in a 4-week exposure test in an agricultural soil amended with metals to concentrations of 100, 200, 400, 800, 1600 and 3200 mg kg-1. Results showed reduction in adult survival and reproductive failure at the highest concentrations (3200 mg kg-1) of Cu and Zn. EC50 reproduction values for Cu and Zn were about 442 and 2760 mg kg-1, respectively. Application of Pb at all levels resulted in large numbers of progeny and no significant mortality compared to controls. Adult growth rate decreased for all metal treatments compared to the controls, suggesting that metals affect S. curviseta metabolism and result in slower growth. We showed that reproduction is a slightly more sensitive parameter than growth. Since a growth test needs fewer juveniles and takes less time than a reproduction test, we conclude that the two parameters are complementary and could be used for a better ecotoxicological evaluation of contaminant levels. However, relative growth and reproduction sensitivities should be tested with more chemicals before a growth test is accepted as a faster sublethal test than a reproduction test.