Higher Level Design - H.L.D.
- Higher Level design is a general system design which estimates the tradeoff between different frameworks, components and database design.
- It deals with Functional and Non Functional Requirements in other words, what are business needs and how should system should work.
Lower Level Design - L.L.D.
- LLD translates HLD to smaller and more specific components.
- It specifies class diagrams, data structures and methods.
- Input for framing LLD is HLD.
- To convert from HLD, we use technique of UML diagram, while designing this Unified Modeling Language diagram we use concepts of OOPS, SOLID principles and design patterns.