13. An article of manufacture, comprising: a processor-readable non-transitory storage medium configured with processor-executable instructions, the instructions when executed by a processor causing the processor to: convert first and second block diagram models into respective first and second text-based models; identify differences between the first and second text-based models; merge identified differences into a third block diagram model which has been converted to a plain text format; and store the identified differences in an electronic storage device.
13. An article of manufacture, comprising: a processor-readable non-transitory storage medium configured with processor-executable instructions, the instructions when executed by a processor causing the processor to: convert first and second block diagram models into respective first and second text-based models; identify differences between the first and second text-based models; merge identified differences into a third block diagram model which has been converted to a plain text format; and store the identified differences in an electronic storage device. 15. The article of manufacture of claim 13 , wherein the instructions further cause the processor to: identify each block that has been added, modified, or deleted; and store data indicating each block that has been added, modified, or deleted.