The second line of research on TGflJ has followed comparisons of units of this model with
those using more direct instruction methods・ Both major reviews of research (Harvey & Jarrett,
2014; Oslin & MitcheD, 2006) suggest equivocal outcomes with respect to skill execution,
particularly on-the-ball skill execution. However, there does seem to be evidence for improve-
ments in off-the-ball movement 但arvey et al., 2009; Gray & Sproule, 201 l;Lee & Whrd, 2009).