HLD vs LLD distinction - Quick Revision & Key Differences

Recall & Review

beginner

What does HLD stand for in system design?

HLD stands for High-Level Design. It shows the big picture of the system, focusing on architecture and main components.

beginner

What is the main focus of Low-Level Design (LLD)?

LLD focuses on detailed design of individual components, including algorithms, data structures, and interfaces.

beginner

Which design level describes the system modules and their interactions?

High-Level Design (HLD) describes system modules and how they interact with each other.

intermediate

Give an example of what you might find in LLD but not in HLD.

In LLD, you might find detailed class diagrams, method signatures, and database table schemas, which are not shown in HLD.

intermediate

Why is it important to have both HLD and LLD in system design?

HLD helps understand overall system structure and flow, while LLD provides detailed guidance for developers to implement components correctly.

Which design level focuses on the overall architecture of the system?

A Testing Plan

B Low-Level Design (LLD)

C Code Implementation

D High-Level Design (HLD)

HLD focuses on the overall architecture and main components of the system.

Which of the following is typically part of Low-Level Design?

A System architecture diagram

B Class diagrams and method details

C User interface wireframes

D Project timeline

LLD includes detailed class diagrams and method specifications.

What is NOT a characteristic of High-Level Design?

A Defines system components

B Focus on modules and their interactions

C Detailed database schema

D Shows data flow between modules

Detailed database schema is part of LLD, not HLD.

Who primarily uses Low-Level Design documents?

A Developers

B Project managers

C End users

D Testers only

Developers use LLD to understand detailed implementation.

Which design phase comes first in the system design process?

A High-Level Design

B Low-Level Design

C Coding

D Testing

High-Level Design is created before Low-Level Design.

Explain the key differences between High-Level Design (HLD) and Low-Level Design (LLD).

Think about the big picture versus the detailed parts.

Why do software projects benefit from having both HLD and LLD documents?

Consider different audiences and purposes.