Quasidiagonal traces on exact $C^{\ast }$-algebras

Recently, it was proved by Tikuisis, White and Winter that any faithful trace on a separable, nuclear $C^{\ast }$-algebras in the UCT class is quasidiagonal. Building on their work, we generalise the result, and show that any faithful, amenable trace on a separable, exact $C^{\ast }$-algebras in the UCT class is quasidiagonal. We also prove that any amenable trace on a separable, exact, quasidiagonal $C^{\ast }$-algebra in the UCT class is quasidiagonal.