Diagrams & data models feedback

Write a comment on two or more of your classmates' Diagram I posts and two or more of your classmates' Data model I posts.

For the diagrams, are the diagrams clear? Are they help you understand the internal workings of the project? Would an additional or different kind of diagram help further your understanding? Provide a suggestion or comment to help your classmates strengthen their diagrams.

For data models, can you think of data that your classmate might need to store that they didn't mention? Is there data they specified that you don't think needs to be stored?  Provide a suggestion or comment to help your classmates strengthen their data models.