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LLDsystem_design~12 mins

What LLD covers vs HLD - Architecture Patterns Compared

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System Overview - What LLD covers vs HLD

This system explains the difference between High-Level Design (HLD) and Low-Level Design (LLD) in software architecture. It highlights what each design phase covers and how they connect to build a complete system design.

Architecture Diagram
Requirement Analysis
↓
High-Level Design (HLD)
↓
Low-Level Design (LLD)
↓
Implementation
Components
Requirement Analysis
process
Gather and understand system requirements from users and stakeholders
High-Level Design (HLD)
design_phase
Define system architecture, main components, and their interactions
Low-Level Design (LLD)
design_phase
Detail internal logic, data structures, and algorithms for each component
Implementation
process
Write code based on LLD to build the actual system
Request Flow - 4 Hops
User → Requirement Analysis
Requirement Analysis → High-Level Design (HLD)
High-Level Design (HLD) → Low-Level Design (LLD)
Low-Level Design (LLD) → Implementation
Failure Scenario
Component Fails:High-Level Design (HLD)
Impact:System architecture is unclear, causing confusion in LLD and implementation leading to delays and errors
Mitigation:Review and refine HLD with stakeholders before proceeding to LLD; use prototypes or diagrams to clarify
Architecture Quiz - 3 Questions
Test your understanding
Which design phase defines the main system components and their interactions?
ALow-Level Design (LLD)
BImplementation
CHigh-Level Design (HLD)
DRequirement Analysis
Design Principle
This architecture shows the layered approach in system design where HLD sets the broad structure and LLD fills in the details. Clear separation helps manage complexity and improves communication between teams.