In the past year, our group has been bypassing the traditional sequence of operation narratives for a combined sequence-FPT format. It does a lot for the design and startup process by thinking through not only how the system will operate, but also how each component within the system will function under each sequence scenario.
In addition, it eliminates the building owner asking the design engineer, "Didn't I buy that the functional performance narrative when I hired you to create the sequence of operation?" Our process combines the sequence with the FPT, and I require that it be done in the schematic phase of the job and not the construction document phase of the job. Why do we do this?