is made up of four words: Keep, Improve, Stop, and Start
Cross-combining good and bad things gives you four situations: things that have been going well should be kept going, things that aren't going well but still need to be done should be improved, things that aren't going well and can be avoided should be stopped, and things that are good but haven't been done should be started. If you have a good memory, just remember the word KISS.
As review models, what's the difference between KISS and GRAI? GRAI means clarifying the goal, comparing results, analyzing the results, and gaining insights. GRAI emphasizes the progressive process of summarizing, while KISS emphasizes a more refined expression of the summary results — it's essentially a clearer combined answer set provided during GRAI's insight stage. After using GRAI to compare current results against past goals and completing the analysis, you end up with a pile of conclusions. When you find those conclusions a tangled mess, you can classify them according to the KISS logic, which makes the summarized conclusions look much clearer. So you can try using these two models together.
Of course, the KISS model can also be used independently. For example, if the goals and results are relatively simple, you can skip GRAI's comparison step and go straight to analysis and summarization.
Use the SMART model to make the conclusions clear, forming actionable, executable goals that enter the next PDCA cycle. This is how the combined use of these well-known models comes together.
SMART - PDCA - GRAI - KISS - SMART