In this paper we continue the study, from Frittaion, Steila and Yokoyama (2017), on size-change termination in the context of Reverse Mathematics. We analyze the soundness of the SCT method. In particular, we prove that the statement any program which satisfies the combinatorial condition provided by the SCT criterion is terminating is equivalent to $mathrm{WO}(omega_3)$ over $mathsf{RCA_0}$
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