Reliability and factorial validity of Adolescent Time Inventory–Time Attitude (ATI-TA) Scores in Scottish and Northern Irish adolescents

• The ATI-TA was developed in the United States.
• We examined scale validity, reliability and invariance in two UK samples.
• The hypothesized six-factor model provided the best fit for the data.
• All alpha and omega estimates were > .70.
• The factor structure was invariant across both research sites.

The contemporary literature investigating the construct broadly known as time perspective is replete with methodological and conceptual concerns. These concerns focus on the reliability and factorial validity of measurement tools, and the sample-specific modification of scales. These issues continue to hamper the development of this potentially useful psychological construct. An emerging body of evidence has supported the six-factor structure of scores on the Adolescent Time Inventory–Time Attitudes Scale, as well as their reliability. The present study utilized data from the first wave of a longitudinal study in the United Kingdom to examine the reliability, validity, and cross-cultural invariance of the scale. Results showed that the hypothesized six-factor model provided the best fit for the data; all alpha and omega estimates were > .70; scores on ATI-TA factors related meaningfully to self-efficacy scores; and the factor structure was invariant across both research sites. Results are discussed in the context of the extant temporal literature.