What is the use of HLD & LLD?

Answer Posted / ashutosh singh

HLD
Based on SRS software analysts will convert the
requirements into a usable product. They will design an
application which will help the programmers in coding.In
the design process the product is to be broken into
independent modules and then taking each module at a time
and then further breaking them to arrive at micro levels
The HLD document contains the following items at a macro
level: - list of modules and a brief description of each
module - brief functionality of each module - interface
relationship among modules -dependencies between modules -
database tables identified along with key elements -
overall architecture diagrams along with technology
details.

LLD:
System analysts prepare a micro level design document
called LLD. This document describes each and every module
in an elaborate manner so that the programmer can directly
code the program based on this. There will be at least 1
document for each module and there may be more for a
module.The LLD will contain: - deailed functional logic of
the module in pseudo code - database tables with all
elements including their type and size - all interface
details with complete API references(both requests and
responses) - all dependency issues -error message listings -
complete input and outputs for a module.

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