HLD 和 LLD 的区别

High Level Design  (HLD)

概要设计说明是指系统的总体设计。它是对应用程序的总体描述。包括系统架构设计、数据库设计、系统、服务、平台及模块间关系的简要描述。它也被称为宏级/系统设计。它是由解决方案架构师创建的。它将业务/客户端需求转换为高级解决方案。它是在详细设计说明(LLD)之前建立的。

Low Level Design (LLD)

简单地说,详细设计说明就像详细的HLD意味着它指的是组件级设计过程。它对每个模块进行了详细的描述,意味着它包含了每个系统组件的实际逻辑,并深入到每个模块的规范中。这也被称为微观层次/详细设计。它是由设计师和开发人员创建的。它将概要解决方案转换为详细解决方案。它是概要设计说明之后创建。

HLDLLD
HLD是指系统的总体设计。LLD就像细化HLD意味着它指的是组件级设计过程。
High Level Design in short called as HLD.Low Level Design in short called as LLD.
It is also known as macro level/system design.It is also known as micro level/detailed design.
It describes the overall description/architecture of the application.It describes detailed description of each and every module.
High Level Design expresses the brief functionality of each module.Low Level Design expresses details functional logic of the module.
It is created by solution architect.It is created by designers and developers.
Here in High Level Design the participants are design team, review team and client team.Here in Low Level Design participants are design team, Operation Teams and Implementers.
It is created first means before Low Level Design.It is created second means after High Level Design.
In HLD the input criteria is Software Requirement Specification (SRS).In LLD the input criteria is reviewed High Level Design (HLD).
High Level Solution converts the Business/client requirement into High Level Solution.Low Level Design converts the High Level Solution into Detailed solution.
In HLD the output criteria is data base design, functional design and review record.In HLD the output criteria is program specification and unit test plan.

ref: https://www.geeksforgeeks.org/difference-between-high-level-design-and-low-level-design/

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