  We present a summary of the main sites for nucleosynthesis in intermediate
mass Asymptotic Giant Branch (AGB) stars. We then discuss some detailed
evolutionary models and how these have been used to create a synthetic
evolution code which calculates the nucleosynthesis very rapidly, enabling us
to investigate changes in some uncertain parameters in AGB evolution, such as
mass-loss and dredge-up. We then present results for C, C/O, Mg and Al. We also
discuss the changes due to the recent NACRE compilation of reaction rates.
