1-level DFD: In 1-level DFD, the context diagram is decomposed into multiple bubbles/processes. Gluecon rocks, and lots of Van Halen references were added for the occasion. … These two algorithms are combined using a linear blend to produce a single higher accuracy estimate. ERModelExample.com. Instead, Netflix uses the personalized method where movies are suggested to the users who are most likely to enjoy them based on a metric like major actors or genre. Some HTML allowed: