Answer / gopal.b

HLD refers High Level Design and
LLD refers Low Level Design

Means HLD contains overview of the design and LLD contains
detailed design.

Answer / bsgsr

hi,everyone,
HLD means high level design
LLD means low level design

HLD: It refers to the functionlity to be achieved to meet
the client requirement. Precisely speaking it is a
diagramatic representation of clients operational systems,
staging areas, dwh n datamarts. also how n what frequency
the data is extracted n loaded into the target database.

LLD: It is prepared for every mapping along with unit test
plan. It contains the names of source definitions, target
definitions, transformatoins used, column names, data
types, business logic written n source to target field
matrix, session name, mapping name.

reach me on bsgsr12@gmail.com 9866188658

Answer / devang

For people who have been involved in software projects, they
will constantly hear the terms, High Level Design (HLD) and
Low Level Design (LLD). So what are the differences between
these 2 design stages and when are they respectively used ?

High – level Design gives the overall System Design in terms
of Functional Architecture and Database design. It designs
the over all architecture of the entire system from main
module to all sub module. This is very useful for the
developers to understand the flow of the system. In this
phase design team, review team (testers) and customers plays
a major role. For this the entry criteria are the
requirement document that is SRS. And the exit criteria will
be HLD, projects standards, the functional design documents,
and the database design document. Further, High level deign
gives the overview of the development of product. In other
words how the program is going to be divided into functions,
modules, subdivision etc.

Low – Level Design (LLD): During the detailed phase, the
view of the application developed during the high level
design is broken down into modules and programs. Logic
design is done for every program and then documented as
program specifications. For every program, a unit test plan
is created. The entry criteria for this will be the HLD
document. And the exit criteria will the program
specification and unit test plan (LLD).
The Low Level Design Document gives the design of the actual
program code which is designed based on the High Level
Design Document. It defines Internal logic of corresponding
submodule designers are preparing and mapping individual
LLD’s to Every module. A good Low Level Design Document
developed will make the program very easy to be developed by
developers because if proper analysis is made and the Low
Level Design Document is prepared then the code can be
developed by developers directly from Low Level Design
Document with minimal effort of debugging and testing.

Answer / purnima

hld means high level design
lld means low level designd ie mapping doc

Answer / kalyani

In addition to the above

HLD will be prepared by the Leads or Managers in rare cases
where as LLD wil be detailed design of HLD and prepared by
the developers like SE or SSE's.

Answer / sukumar

HLD : High Level Design
LLD : Low Level Design

HLD: It gives the ovreall designing designing to be done to complete a product. It is moreover block digramatic description of a complete design.

LLD: It reveals the complete details to be complted to get the product finished. It gives the designing of inside modules of blocks specified in HLD.

For example, HLD is just representing a computer by different blocks like CPU, I/O devices, Memory etc. Where as LLD with respect to this example is detailed description of all the blocks of HLD like CPU, I/O devices, Memory etc.

Answer / pradeep singh

High Level Design, means precisely that. A high level
design discusses an overall view of how something should
work and the top level components that will comprise the
proposed solution. It should have very little detail on
implementation, i.e. no explicit class definitions, and in
some cases not even details such as database type
(relational or object) and programming language and
platform.

A low level design has nuts and bolts type detail in it
which must come after high level design has been signed off
by the users, as the high level design is much easier to
change than the low level design.

Answer / ajit

HLD is the over all overview design of the system whereas
LLD is the not over all design,it is a detailed design of
the each part of the system.

HLD is always done before the LLD.

Answer / uday batta

High Level Design (HLD) is the overall system design - covering the system architecture and database design. It describes the relation between various modules and functions of the system. data flow, flow charts and data structures are covered under HLD.
Low Level Design (LLD) is like detailing the HLD. It defines the actual logic for each and every component of the system. Class diagrams with all the methods and relation between classes comes under LLD. Programs specs are covered under LLD.
- (UdAY)

Answer / rt

HLD is the main block of the program
LLD is the sub blocks from the main block of the program

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