You don't always have to explain a process through flowcharts. Static images and flowcharts may visually depict the processes but may not always be effective - particularly in cases of complex and multi-stage processes.
There are several instructional aids that can be used to train employees on processes. These instructional aids enable learners to understand complex processes easily and transfer the knowledge in the actual job situation.
Together with the help of authoring tools these instructional aids can be used to develop process training program that stays with your learners for a longer period. Here is a presentation titled, "Tips to Build a Compelling Online Process Training Program" that talks about the instructional aids that help in teaching processes.