 This thesis (2) should be uncontroversial. There are, however, concerns that the thesis is so uncontroversial that any distinction between the dynamical approach and its opponents in the context of theories such as GTR (and, in particular, without the regularity relationist approach to ontological reduction applied in the case of theories with fixed spacetime structure) has been effaced (Pooley 2013; Read 2020a). Even setting this aside, there are also disagreements regarding how exactly a piece of structure in a given theory is to acquire its ‘chronogeometric significance’ – that is, for the intervals which it determines to be accessible operationally to physical bodies and measuring devices. Brown’s preferred answer to this question (Brown 2005, ch. 9) makes appeal to the ‘strong equivalence principle’. There are a great many subtleties and technical difficulties which need to be overcome in order to attain a clear understanding of this principle (Read, Brown &amp; Lehmkuhl 2018; Weatherall 2020), but, roughly speaking, it states that, in local regions in GTR, matter fields can be understood to obey Lorentz covariant dynamical equations, just as in STR (we have already seen something of this in section 2 above). Absent further details, pace Brown, it is not clear why this is sufficient to secure the ‘chronogeometric significance’ of the metric field in GTR. Even setting this aside, there are questions regarding whether the strong equivalence principle is necessary for chronogeometric significance. For example, an alternative approach might make appeal to the results of (Ehlers, Pirani &amp; Schild, 1972), in which the authors demonstrate that the trajectories of massive and massless bodies are sufficient to reconstruct the metric field in GTR (cf. (Malament 2012, §2.1)). These issues are raised in (Read 2020a), but much work remains to be done in uncovering the full range of ways in which a given piece of structure might come to have chronogeometric significance.