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We provide a comprehensive test of factorization in the heavy-heavy $B$decays motivated by the recent experimental data from BELLE and BABARcollaborations. The penguin effects are not negligible in the B decays with twopseudoscalar mesons. The direct CP asymmetries are found to be a few percent.We give estimates on the weak annihilation contributions by analogy to theobserved annihilation-dominated processes. The $N_c$ insensitivity of branchingratios indicates that the soft final state interactions are not dominant. Wealso study the polarizations in $B\to D^*D_{(s)}^*$ decays. The power law showsthat the transverse perpendicular polarization fraction is small. The effectsof the heavy quark symmetry breaking caused by the perturbative QCD and powercorrections on the transverse polarization are also investigated.Comment: 23 pages, 1 figure, published version, one reference adde

Factorization and polarization in two charmed-meson B decays