If the data for a study (especially in social science context) are collected at different time periods (say t1, t2 and t3), does it qualify as a three wave study or a longitudinal study? What would be the specific applications of wave vs. longitudinal design as per research question? Also, is it correct to say" "To avoid common method bias, data were collected at two different points of time.". Would a wave study qualify as a procedural remedy to avoid common method bias? Thanks!