There is no doubt that attention and (un)awareness in second/foreign language (L2 learning) are two constructs that have permeated, explicitly or implicitly, second language acquisition (SLA) studies since their inception. Indeed, we have witnessed several empirical studies attempting to probe more deeply into the roles of these two constructs in the L2 learning process. Given the challenging methodological issue of eliciting and interpreting data on such internal processes, this paper underscores the importance and benefits of conducting replications of studies investigating both the roles of attention and awareness, or lack thereof, in the L2 learning process. A report on two key SLA studies is provided and several suggestions for replication are made for each study together with their accompanying potential benefits.