Farook Mohammad Fathi Al-Shamali2022-05-182022-05-185156https://drepo.sdl.edu.sa/handle/20.500.14154/2982The form factors of the current matrix elements corresponding to the transitions D --->K, K* are available from two experimental measurements and two lattice calculations. These values have been used to study several nonleptonic D⁰ decays that admit factorization and contain a strange meson (K,K*) in the final state. Furthermore, these form factors have been used to calculate the corresponding ones for B decays using flavour symmetry. This enabled us to study two factorizable B decays involving a strange meson. Our results for the branching ratios provide a support for the factorization hypothesis. Also, flavour symmetry seems to be working very well.enThesis