Difference Between High Level Design and Low Level Design

By BYJU'S Exam Prep

Updated on: September 25th, 2023

The major Difference Between High Level Design and Low Level Design is that high level design is concentrated on the overall and complete system design, whereas the low-level design is focused only on the specific module. Both HLD and LLD are focused in design process of a system.

Difference Between High Level Design and Low Level Design PDF 

Here, we will discuss the difference between high level design and low level design based on various aspects, along with an individual discussion of both levels of the design.

Difference Between High Level Design and Low Level Design

High-Level Design and Low-Level Design are specified in the system’s design. Both help in the smooth functioning of the system. The difference between high-level and low level design is covered in the GATE CSE exam. Let us see the difference in the table provided below.

Key Differences Between High-Level Design and Low-Level Design

High-Level Design Low-Level Design
High-Level Design is called HLD. Low-level design is called LLD.
It is a complete system design. It is a component design of a system.
HLD is also called Macro level design. LLD is also called Micro level design.
The high level design is the overall application specification and framework.

Low level design is the module specification and framework.

Modules of the system are not elaborated to a deeper extent. The modules are explained on a deeper level, and their functionality is explained.
The solution architect produces the high level designs.  Low level designs are formulated by the coders and developers.

What is High-Level Design?

High-level design is a system design. It is the design which elaborates on the complete structure of the application. The high-level design carries the following details:

  • System architecture,
  • System description,
  • Services and Database design,
  • Platforms
  • Module Relationships.

In the High-level design, the solution architect  focuses on the following details:

  • Flow Charts
  • Decision Trees
  • Data Dictionary
  • Decision Tables
  • Flow Diagrams

What is Low-Level Design?

The LLD full form is a low level design. It is the micro-level design of the system where the designer concerns with the modules in the system. The actual logic of the system is focused on this level of design.

The low level design is dependent on the high-level design for the reviewing of the input criteria. Whereas the output criteria are the specification of the program and unit test plan. The LLD is produced by the developers, unlike the HLD.

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