Four items provide a global assessment of how positive, appealing, and satisfying a consumer considers a brand's overall customer journey experience. Kuehn, Jozic, and Homburg (2019) used this as a dependent variable in an additional study with 190 participants to demonstrate the convergent validity of the CJD second-order scale. The CJD scale explained 66% of variance in this global measure. AVE was .74.
Kuehn, C., Jozic, D., & Homburg, C. (2019). Effective customer journey design: Consumers' conception, measurement, and consequences. Journal of the Academy of Marketing Science, 47(3), 551–568.
Free access to 2023+ psychometric scales at PsychScales