Electrical Diagram. Circuits and Logic Diagram. Industrial Control Systems. Process Flow Diagram Software. Business Flowchart. Do not get upset: focus on making the diagram readable. You can use different colors or line widths, or different line styles dotted, solid, etc. If you use a custom tool like I am you need to include a Legend block. It's not obvious what the arrows mean, and what is the color's meaning. Legend explains it. The common question when using cloud is: do you include the managed services, like queues and messaging solutions?
I tend to answer no. This complicates the diagram instead of making it easier to read. If some services are communicating through a message queue, display it via separate type of arrow. I teach my fellow architects to follow the layered approach when they create container or components-and-connections diagrams. Those diagrams tend to include many entities and structuring them with layers increases readability.
Summary Container diagram provides insight into which deployable items your backend consist of and how those components talk to each other. Sequence Diagram Sequence diagrams show different stages of a process The first two diagrams show how the elements of the system relate to each other. Sequence diagram for Google One-Tap Sign-In At the top we see interacting entities: persons, web and mobile applications, external systems, services and data stores.
How to draw Choose a business case a user sign-in, a purchase, etc. Identify the entities involved in the use case Put them on the diagram Add interactions arrows Provide valuable comments to each arrow Tools Unfortunately, OmniGraffle is not suitable for sequence diagrams. Important highlights Sequence diagram is an absolute must when designing a new feature you add to the system. It shows the affected parts of the system, points of integrations with external software and contracts which the team will have to create or update.
Sequence diagram is valuable for QA engineers as well. It provides the insights where the potential issues can be located and serve as a source of truth for Test Cases. Few months in a project, and we still faced the issues when the parts of the system were not ready for a long awaited feature.
Stakeholders were not happy at all, and there was a traction between different teams. We discussed the issue and agreed to make architecture design before the imlementation. Sequence diagrams were a great help: now we know the full picture before writing the code, not after. Vladimir, Solution Architect Summary Sequence diagrams allow to document the behavior of the system in different business cases. Deployment Diagram The system can not gain value before it is deployed to production. There are several different things you want to display.
Availability Zones. You can think of them as data centers. Infrastructure Nodes. How to draw Place the major building blocks: browsers, mobile devices, public cloud, data centers Place the computing and storage resources Add infrastructure nodes Add networks Add the network calls between nodes Add the monitoring resources Add scalability comments if required Example C4 notation has a supplementarty deployment diagram: Mind the names of the compute resources, their types and node numbers.
Important Highlights Every system has the requirements on security, performance, availability and other -ilities. Deployment diagram helps to address those requirements. In most cases deployment diagram is the only one depicting the network aspects of your solution. Deployment diagram should show how the requests are going through the system in a clear, understandable way.
Summary Deployment diagram complements the understanding of the system from the physical appearence perspective. This type of architecture also lends itself to greater flexibility and extensibility of the system, enabling it to grow and evolve more easily to adjust for changing requirements and demands.
Creating a system block diagram early in the development process is critical for assembling teams of develops that can work in parallel on the project. A system block diagram displays the high-level view of the encapsulated functional modules that compose a system. A system block diagram may show multiple layers of encapsulation, though internal layers are often relegated to separate diagrams for clarity's sake. In terms of system design, the modules in the system block diagram should exhibit maximal decoupling from each other.
System Dynamics is the study of the behavior of complex systems - seeking to understand the web of relationships between activities and to identify the linkage between cause and effect. System Diagrams are models used to visually express the dynamic forces acting upon the components of a process and the interactions between those forces.
System Diagrams are more than process flow charts. They include feedback loops and other factors that influence how decisions are made, including attitudes, perceptions, and behaviors.
If you are familiar with the terms "vicious circle", "downward spiral", "the law of unintended consequences", or "the cure is worse than the disease" you are familiar with some of the basic concepts of System Dynamics.
System Diagrams provide a common language to help organizations think about these complex issues. Efforts to improve the performance of complex systems inevitably touch on many areas directly and indirectly, so it is critically important to understand the potential for unintended consequences.
It is also important to understand the true leverage points to improve a system, which probably won't be obvious. Systems Thinking initiatives strive to broaden organizational perspective by moving the organization away from a focus on Events reaction to recognizing Patterns of Behavior, then understanding Systems, and finally to master the Mental Models which frame the perspectives of the people who drive the system and ultimately determine its performance.
As you work to understand System Dynamics you will undoubtedly encounter the following phenomena, many of which may already be familiar:. Creating System Diagrams is the first step to develop the System Thinking skills needed to understand and manage these complex phenomena.
The best way to gain an understanding of Systems Thinking is to review some real world examples:. To create a System Diagram, recall the hierarchy of system understanding - with the goal of moving away from managing events reactive to managing systems and mental models proactive :.
For an example, we'll use a sales and profitability example from an appliance manufacturer trapped in a downward spiral of price discounting to maintain sales volume. Next, look at patterns of behavior. Graph the indicators that help describe the problem:. Third, identify the activities that are involved, and draw linkages to show forces and feedback loops , as in the diagram below. Use the 5-Why Analysis from the Toolbox to help identify the root cause of behaviors and patterns.
Note: In this diagram, all of the feedback loops are Reinforcing Loops, amplifying the main effect of price discounting - a strong engine of decline.
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