“…In contrast, Cattelani and colleagues (2010) stress that the limitations of group-design studies in terms of including participants with very different demographic characteristics, aetiology, site of brain damage, and so forth, hinder the assessment of how large the effect of a treatment would be for a particular patient. Some of these issues of uncontrolled factors affecting the certainty of the causal effect of interventions can be addressed in SCEDs, especially if recommendations on study conduct (Horner et al, 2005;Tate et al, 2013) are followed, including measures of maintenance and generalization (frequently missing according to Ylvisaker et al, 2007), social validity, and procedural fidelity (also rare according to Heinicke & Carr, 2014), among others. Thus, the combination of several methodological options and the integration of results across studies can prove to be very useful in the field.…”