📝§ Software Design

Software Design is a larger activity that includes both high-level § Software Architecture and low-level component design.

• § Software Architecture

• Constraints as guide rails

  • Constraints provide consistency

• Design Stamina Hypothesis

• Technical design helps to save time on reworks

• Conway’s law—architecture reflects communication structure of organization

  • Make sure the organization is compatible with the product architecture

• Theory Building View of programming

  • As a software architect, describe the theory you built

• Metaphors we use influence what solutions we see

• Encapsulation is a subset of Modularity

• “Goto considered harmful” is about unconstrained goto

• Make decisions at the Last Responsible Moment

• Reification

• Intuitive solutions have to be rationalized

• Postel’s Law

• Lexorank

• Data outlives code

• Software development principles

  • DRY: Don’t repeat yourself

    • DRY is not about code but functionality

  • Deep/shallow modules

    • API/SLOC

• Separate storage and query layers (data store design)

• Sign-offs encourage Big Design Up Front

Resources

• Ousterhout₂₀₁₈