Technical Documentation: What is the difference between HLD, LLD, DLD?

Table Of Content

• Part 5: High-Level Solution Design (HLD) Documents: What Is It and When Do You Need One
• 5 Server-Sent Events(SSE)
• Video production seniors shoot Western short ‘Ghosts of Gold Creek’ in Montana
• Analyzing and Decomposing the System into Modules and Components
• About This List
• Benefits and Advantages of Creating a High-Level Design

HLD documentation should cover the planned implementation of both software and hardware. High-Level design can provide a framework or guidance for across the team the get a better understanding of the feature. This documentation can drive the detailed design to follow the overall solution. To create a High-Level Design there are many approaches to start with.

Part 5: High-Level Solution Design (HLD) Documents: What Is It and When Do You Need One

Technical documentation, architecture, and design, especially for large system integration projects, remain integral parts of the delivery of large software projects. As mentioned earlier, prototyping and wireframing the user interface provide valuable insights into the system’s look and feel. Create wireframes and mockups using design tools of your choice to represent each screen’s layout and flow. This will assist in aligning stakeholders’ expectations and gaining valuable feedback.

5 Server-Sent Events(SSE)

Top-level design charts course for Jing-Jin-Ji coordinated development - China Daily

Top-level design charts course for Jing-Jin-Ji coordinated development.

Posted: Fri, 01 Mar 2024 08:00:00 GMT [source]

The value of documentation and design has been downplayed significantly with Agile practices, although the advent of powerful content creation tools like Confluence has started to reverse the tide. This article examines all aspects of a High-Level Design for a project. It will give software practitioners an idea of when, why, and how to create a valuable HLD. Architecting a solution generates different concepts and selects an optimal candidate that satisfies budgetary and planning constraints while mitigating project risk. I use the E/R diagram standards to indicate cardinality (one-to-many, many-to-many), as I find they are easier for non-technical folks to understand than UML. But I pull in the triangle notation from UML to indicate the is-a-kind-of relationship such as the different types of questions above.

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This establishes the foundation for the rest of the design, and it establishes the foundation for clear and accurate communication with the product owner and everyone else who will be using the system. The two goals here are to get aligned with the domain experts on how they speak of things and how these things interact with each other. Preliminary design—In the preliminary stages, the need is to size the project and to identify those parts of the project that might be risky or time consuming. Incomplete migrations hurt a system in the long run; they addenormous complexity, hurt reliability, and make programming unpleasant. If existing systems must be turned down to achieve the proposed design, describe how that transition will happen.

Let’s briefly examine architecture and how its documents are relevant to High-Level Design. This investment cannot be justified at the early stages of a project as the stakeholders have yet to sign off on the requirements, Statement of Work, and scope. Preparing a Low-Level Design is a multi-iteration, customized, bespoke, and expensive process involving a broad audience of technical staff (business analysts, developers, testers, and DevOps engineers).

Analyzing and Decomposing the System into Modules and Components

The main thing is to show what the components are that will need to be built or interacted with to support this design. There is nothing so frustrating as a diagram and nothing else, and you are left to try and figure it out for yourself. Here’s an example of one I might have pulled together with a product owner to define a domain for a survey feature. The first section I always have is an overall problem statement, and then a list of requirements. I strive to have these requirements defined as scenarios, use cases, or acceptance criteria.

It helps in identifying potential risks and challenges early in the development process, allowing for timely mitigation strategies. Additionally, it serves as a communication tool, helping to convey the system’s design and functionality to stakeholders, including developers, testers, and project managers. High-level design (HLD) is a crucial phase in the software development life cycle (SDLC) where the architecture of a software system is conceptualized and defined. It focuses on defining the overall structure of the system, including its components, modules, interfaces, and data for meeting functional and non-functional requirements. This article explores the concept of high-level design, its importance, key components, and best practices.

Create data flow diagrams and define the information architecture of the system. This will provide a clear understanding of how data is processed and stored within the system. It is the main point of interaction between the user and the system. Therefore, prototyping and wireframing the user interface is an important step in the high-level design process.

Also it’s not uncommon for the process of building the domain model to impact the requirements. A well-designed high-level structure should prioritize modularity and scalability. Breaking down the system into logical modules allows for easier development, testing, and maintenance. Additionally, designing with scalability in mind ensures that the system can handle future growth and changes in requirements.

Data flows, flowcharts, data structures are included in HLD documents so that developers/implementers can understand how the system is expected to work with regards to the features and the design. It describes the relation between various components and functions of the system. It defines the actual logic for each and every module of the system, design Architecture to understand the flow of the system with function and database design. LLD is the process of taking the high-level design (HLD) and creating a more detailed, technical representation of the system.

The anticipated language would address all the above issues at the price of confinement to a specific set of rules. Let’s say you have implemented a banking system that allows customers to enter any branch and open a bank account for personal or business use. Everyone is responsible for a particular step in the application’s approval process.

The idea is to keep the keep the design simple to understand, easy to follow and clear about assumptions and tradeoffs. A good HLD should be able to communicate your thoughts to your expected audience. Now before proceeding further think of what will happen to the server if there is no request thrown by clients. Here Web Sockets play a crucial role that solving problems and enabling us to have real-time communication. They are more or less used in every system to be designed because we can not let our system wait for a response. They are very useful in Real-time web applications, gaming applications, chat applications.