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Sequence diagrams, the only good thing UML brought to software development (mermaidchart.com)

623 points by knsv · 1169 days ago · 356 comments on HN

Article summary

The article discusses the value of sequence diagrams, a type of diagram that originated from the Unified Modeling Language (UML), in software development. Despite UML's decline in popularity, sequence diagrams remain a useful tool for documenting and designing complex systems. They provide a clear and concise way to visualize the interactions between different parts of a system. The article also explores the history of UML and its limitations, which led to its eventual decline.

Main themes

  • UML and sequence diagrams
  • software development methodologies
  • team maturity and culture
  • code documentation and communication
  • complex system design
  • legacy software and maintenance

What commenters say

  • UML is considered useless in modern software development, with sequence diagrams being the only valuable aspect of it.
  • Sequence diagrams are useful for communicating complex systems and interactions, but UML as a whole is too cumbersome and outdated.
  • The use of UML and sequence diagrams depends on the maturity and culture of the development team.
  • Some argue that UML diagrams are redundant and do not provide any additional information beyond what is already present in the code.
  • Others believe that UML and sequence diagrams can be useful for capturing requirements, communicating with teams, and testing software.
  • Mature teams prioritize writing code over creating UML diagrams, which are seen as unnecessary and time-consuming.
  • UML diagrams can become outdated quickly if not maintained, which can lead to confusion and misinformation.
  • The value of UML and sequence diagrams lies in their ability to provide a high-level understanding of complex systems and interactions, rather than duplicating information already present in the code.