A method for generating source code from one or more blocks of a block diagram includes: generating the block diagram; determining whether the descriptors of first and second block variables are concordant or different and whether or not first and second blocks are located in the same region; and implementing the first and second block variables as a single variable or as two separate variables in the source code based on the determination of whether the descriptors of the first and second block variables are concordant or different and whether or not the first and second blocks are located in the same region. The first and second block variables are implemented in the source code as a single variable if the descriptors of the first and second block variables are concordant and the first and second blocks are located in the same region.