Phase 1 Pool development, and reduction and refinement 1

Phase 2 Pool reduction and refinement 2 after expert panel review & Focus Group

Phase 3 Pool reduction and refinement 3 (item analysis and PCA) after pilot testing the final pool

− Item generation and collection.

− Pool reduction and refinement (iteration 1)

− Language adaption of English items in Greek

− Expert panel to verify content validity

− Focus Group to examine face and aspects of content validity

− Further pool reduction and refinement 2 to generate the Final Pool (114 items)

− Scaling selection & instructions

− Pilot study of the final pool (N = 190)

− Item analysis of the final pool, reduction and refinement (iteration 3)

− Principal Components Analysis (PCA)

− Finalizing the final version to be validated in a large sample