The aim of the present study was to describe the TOPS development
phases and to establish the instrument’s validity and reliability among
adults aged 18–44 years. The research hypotheses, which relate to various
aspects of the tool’s validity and reliability, were as follows: (1) Construct
validity A: A factor analysis will establish the constructs covered by the
scale, based on the theoretical background and interview contents. (2)
Internal consistency: Moderate to high internal consistency will be achieved
for the TOPS questionnaire as a whole and for each of its factors, based on
data from approximately 200 participants. (3) Construct validity B: Significant
differences between three age groups will be found for the factor scores.