 In summary, whilst Gómez, Juristo, and Vegas’s typology draws distinctions in slightly different places to Schmidt’s, its purpose is arguably the same—to explain what types of alterations in replication studies fulfil different scientific goals, such as establishing internal validity or the extent of generalization and so on. With the exception of his discussion of reproducing the material realization, Radder’s other two categories can perhaps be seen as fitting within the larger range of functions described by Schmidt and Gómez et al., who both acknowledge that in practice, direct and conceptual replications lie on a noisy continuum. 