This paper provides new empirical evidence on the effects of internal collaboration (manufacturing involvement) and external collaboration (supplier and customer involvement) practices on NPD performance and success. Moreover, comparing the collaboration practices and their effects on NPD across 10 countries are provided. Data were collected from high-performance manufacturing (HPM) project with the sample of 265 manufacturing companies from 10 countries across the world. Descriptive, variance, correlation and regression analysis were conducted by using SPSS 22.0. Significant linkage between three collaboration practices and NPD performance & NPD success was found by statistical analysis. In addition, the results of this study reveal the significant differences in the implementation of collaboration practices across countries and the effects of those practices on NPD performance and success among countries. This study suggests that high performance and high success rate of NPD process could be achieved by external and internal collaboration in manufacturing companies.