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ASAD can be thought of as a 'black box' which can be plugged into models of the atmosphere and used to solve a chemical scheme developed by the user. ASAD includes all the subroutines to perform the time integration of the scheme. It also includes standalone programs to help you to develop your own chemistry scheme. ASAD allows the user to develop chemistry schemes without writing any fortran code. The scheme is specified by input files; a choice of species and reactions, and the ASAD subroutines will automatically solve the resultant equations. The advantages to using ASAD are that the development time for a chemistry scheme is substantially reduced, the code will easily plug into any atmospheric model so moving schemes from one model to another is simple, coding errors are greatly reduced and the user has a builtin choice of time integration schemes and approximation methods for atmospheric chemistry, such as the use of chemical families.