- Start: Waterfall is the mainstream methodology
- The mainstream methodology shows some limitations
- Somebody proposes a new, or lesser-known, or almost forgotten methodology and shows how it addresses the limitations at step 2 (and how it’s better than Waterfall, of course)
- After a long argument, heavily based on personal opinions, and often light on facts, the methodology at step 3 becomes the mainstream one
- Go to step 2