In this article, we assess the structural equivalence of the Zimbardo Time Perspective Inventory (ZTPI) across 26 samples from 24 countries (N = 12,200). The ZTPI is proven to be a valid and reliable index of individual differences in time perspective across five temporal categories: Past Negative, Past Positive, Present Fatalistic, Present Hedonistic, and Future. We obtained evidence for invariance of 36 items (out of 56) and also the five-factor structure of ZTPI across 23 countries. The short ZTPI scales are reliable for country-level analysis, whereas we recommend the use of the full scales for individual-level analysis. The short version of ZTPI will further promote integration of research in the time perspective domain in relation to many different psycho-social processes.

The developed CFQ provides an assessment instrument of the hypothetical construct invoked to explain the chewing function. Psychometric properties are satisfactory demonstrating that the instrument is suitable for the assessment of a self-perceived chewing function.

This three-wave cross-cultural study tested a cross-cultural model that related adolescents' Regulatory Focus (RF) and Future Time Perspective on School and Professional Career (FTP) to their educational and career behaviors, and explored whether these relationships are equivalent across countries. Specifically, it addressed the challenging question whether adolescents' motivational orientations differ across countries with vastly different cultural values, socio-economic circumstances and history. A total of 1520 adolescents in the Netherlands, Serbia, and Croatia reported their parents' and their own RF (promotion and prevention), FTP on school and professional career, investment in learning and homework, and career planning, on three time points. Teachers assessed adolescents' investment in learning and provided adolescents' GPA. Based on the multi-group structural equation modeling results, we found good model fits for each country and confirmation of most hypotheses. Results supported that the hypothesized model was cross-culturally valid in the three countries, although FTP related differently to GPA and teacher ratings across the samples. Also, we revealed intriguing differences on adolescents' FTP and RF strategies across the three countries. The findings suggest that FTP and RF play an important role in the learning efforts and career planning of adolescents across different countries.

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