Friday 23 September 2011

Differences between HLD and LLD


Differences betweem High level design and low level design :
HLD is a overall system design where as LLD defines the actual logic for each and every component in the system
Data flow, flow charts and data structures are covered under HLD
Class diagrams with all the methods and relation between classes comes under LLD. Programs specs are covered under LLD
For HLD
Entry Criteria : SRS
Exit Criteria   : HLD, projects standards, the functional design documents, and the database design document
For LLD
Entry Criteria : HLD
Exit Criteria   : program specification and unit test plan (LLD)

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