 An alternative TT proposal is that we can beset explain the aforementioned developmental changes in humans by positing the existence of two functionally distinct ToMs. On this theory, one type of ToM underwrites adult FP capacities to ascribe propositional attitudes. Yet we also make use of a more minimal ToM, one which employs and attributes weaker concepts than that of belief proper. This second, earlier developing ToM is, ex hypothesi, used for fast and efficient, but limited ToM tasks (Apperly &amp; Butterfill 2009; Butterfill &amp; Apperly 2013). On this dual-ToM theory, our first ToM never grows up. Instead, radically new concepts and principles come into play with the advent of our adult ToM, which arrives at around ages 3 to 4 in normally developing Western populations. After that point, both ToMs begin to work alongside one another.