SDL — Systems Engineering

To make a SDL Diagram with help of ConceptDraw DIAGRAM diagramming and drawing application is much simpler, especially if you have the Specification and Description Language (SDL) Solution downloaded from ConceptDraw STORE.

Specification and Description Language (SDL) Solution

Example 1. Specification and Description Language (SDL) Solution in ConceptDraw STORE

A specification language is simply a formal language which is widely used in the computer science during conducting the requirements analysis, the systems analysis and the systems design for describing a system at a much higher level to compare to a programming language, known to be used for producing the executable codes for the systems.

All the specification languages are usually not directly executed. They are used for describing the issues, which are the answers to such question as “what?”. In case there is some requirement specification, which is cluttered with the implementation details known to be unnecessary, then it can be expected to be considered simple as an error.

The well-known fundamental assumption of most of the specification approaches is that programs are modelled as model-theoretic or algebraic structures, including a collection of sets of data values, as well as the functions over the mentioned sets. Such level of abstraction coincides with such point of view that the correctness of the input as well as an output behaviour of a program can take the precedence over all its other properties.

In the so called property-oriented approach to specification, the specifications of the programs are known to be consisting of the logical axioms, describing the properties that the functions have to satisfy. This approach is known to be opposite to the so-called “model-oriented specification” in such frameworks as Z and VDM, consisting of a simple realization of some particular behaviour which is nowadays required.

Specifications are expected to be the subject to such process, as a process of “refinement”. This process can be described as the filling-in one of the implementation details just before they are good enough to be implemented. The result of the described refinement process is a so called “executable algorithm”.

The mentioned algorithm is the one, which is either formulated in an executable subset of the specification language at hand or in some programming language. An important thing about the use of the specification languages which has to be mentioned is that it enables the creation of proofs of program correctness.

One of the kinds of the specification language is a Specification and Description Language (SDL). This language is targeted at the unambiguous description and specification of the behaviour of distributed and reactive systems.

Example 2. SDL Diagram

Providing both textual Phrase Representation (SDL/PR) as well as a graphical Graphic Representation (SDL/GR), The Specification and Description Language is known to be very commonly used worldwide. The mentioned types of the representation — the graphic and the textual ones — are both equivalent representations of the same semantics.

The models within the mentioned language are usually represented in the graphical SDL/GR form, when SDL/PR is more often used for exchanging the models between different tools. Any system can be specified as a set of the interconnected abstract machines, known to be the extensions of the finite state machines, also known as “FSM”. Due to the language is formally complete, it can be used for code generation for either final targets or for a simulation.

The Specification and Description Language is known to be covering five main aspects: communication, structure, behaviour, inheritance and data. The behaviour of the components can be explained by partitioning the system into a series of hierarchies. The communication between the components can take place through gates which are all connected with help of the channels. These channels are known to be those of the delayed channel type, so such communication is usually expected to be “asynchronous”. In case, though, the delay is set to zero, then the communication may become “synchronous”.

The structure of the hierarchy level of Specification and Description Language is known to be the following: Library package, Block agent, System agent, Procedure type, Process agent, Architecture and Remote procedure. Any Specification and Description Language system is made of the functional blocks, each of which can be further decomposed in the so called “sub-blocks”. The lowest level block is known to be composed of one or more processes described as the finite state machines. The mentioned blocks are all connected with help of channels, as it was already mentioned before, and so these channels carry the messages, also known as “signals”, exchanged between different blocks. A block agent is known to be consisting of the process agents.

SDL Process Game

Example 3. SDL Process Game

Each of the process agents is simply a state machine which contributes to the action, which is carried out by the system itself. A message stimulus is known to be coming from the environment to an agent and it is known to be called as a “signal”. By the way, such message stimulus can also come from another agent as well. All the signals which are received by a process agent are all placed on the first place in a queue, which is also sometimes known to be called as the “input port”.

When the state machine is known to be waiting in a state, in case the first signal in the previously mentioned input port is enabled for that state, then it starts a transition, which is expected to be leading to the following states. Transitions are also known to be able to output the signals to the environment as well as to the other agents. Any process agent is known to be allowed to contain any needed procedure types, resulting in the same actions being able to get invoked from the different places. It is also important to mentioned that it is always allowed to call a remote procedure type in order to invoke a procedure in another agent (or sometimes in another system) and later to wait for a response.

Related Solution:


SDL Diagram

Specification and Description Language (SDL) is used for creating the object-oriented diagrams, visualizing the processes of the state machines for the systems of communication, telecommunication, automotive, aviation and medical industries. SDL is a specification language for creating specifications, descriptions of the behavior, data, and inheritance for real-time systems. This sample shows the SDL Diagram of the process game.SDL process game
Picture: SDL Diagram
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Types of Flowcharts

A flowchart is a simple but very functional tool when it comes to understanding a workflow or to removing unnecessary stages from a process. When drawing flowcharts, keep in mind that there are four common types of flowcharts, like document flowcharts and data flowcharts that show control over a data or document flow over a system. To show controls on a physical level, use system flowcharts. In addition, to show controls in a program, you can draw a program flowchart. This flowchart diagram represents the piece of an article editing process, that involves the author and editor. It was created using the Basic Flowchart notation that consists from the basic flowchart symbols. The start and the end of the process are indicated with "Terminator" symbols. The "Process" symbols show the action steps consisting from making edits and searching for a compromise, when the author does not agree with the suggestions of the editor . The "Process" symbol is the general symbol in process flowcharts. The "Decision" symbol indicates a branching in the process flow. There are two branches indicated by a Decision shape in the current flowchart (Yes/No, Disagree/Agree). This basic flowchart can be used as a repeating unit in the workflow diagram describing the working process of some editorial office.Types of Flowcharts
Picture: Types of Flowcharts
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Cross-Functional Flowchart

There are many tools to manage a process or to illustrate an algorithm or a workflow. Flowcharting is one of those tools. However, it may be difficult to show complex processes that require multiple attributes or several people in a simple flowchart, so a cross-functional flowchart would be a solution for that situation. To create such flowchart, group processes and steps to labeled rows or columns, and divide those groups with horizontal or vertical parallel lines. It is worth mentioning that there are different types of cross-functional flowcharts, like opportunity or deployment flowchart. This diagram shows a cross-functional flowchart that was made for a trading process. It contains 14 processes, distributed through 5 lines depicting the participants who interact with the process. Also there are connectors that show the data flow of information between processes. The cross-functional flowchart displays a detailed model of the trading process, as well as all participants in the process and how they interact with each other. The lines in the flowchart indicates the position, department and role of the trading process participants.Cross-Functional Flowchart. flowchart maker
Picture: Cross-Functional Flowchart
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Process Flowchart

When trying to figure out the nature of the problems occurring within a project, there are many ways to develop such understanding. One of the most common ways to document processes for further improvement is to draw a process flowchart, which depicts the activities of the process arranged in sequential order — this is business process management. ConceptDraw DIAGRAM v12 is business process mapping software with impressive range of productivity features for business process management and classic project management. This business process management software is helpful for many purposes from different payment processes, or manufacturing processes to chemical processes. Business process mapping flowcharts helps clarify the actual workflow of different people engaged in the same process. This samples were made with ConceptDraw DIAGRAM v12 — business process mapping software for flowcharting and used as classic visio alternative because its briefly named "visio for mac" and for windows, this sort of software named the business process management tools. This flowchart diagram shows a process flow of project management. The diagram that is presented here depicts the project life cycle that is basic for the most of project management methods. Breaking a project into phases allows to track it in the proper manner. Through separation on phases, the total workflow of a project is divided into some foreseeable components, thus making it easier to follow the project status. A project life cycle commonly includes: initiation, definition, design, development and implementation phases. Distinguished method to show parallel and interdependent processes, as well as project life cycle relationships. A flowchart diagram is often used as visual guide to project. For instance, it used by marketing project management software for visualizing stages of marketing activities or as project management workflow tools. Created with ConceptDraw DIAGRAM v12 — business process mapping software which is flowcharting visio alternative or shortly its visio for mac, this sort of software platform often named the business process management process flowcharts, flowchart symbols, process flow diagram, workflow diagram, flowchart maker
Picture: Process Flowchart
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ConceptDraw MINDMAP v10 :Brainstorming, Mind Mapping for macOS and Windows

ConceptDraw MINDMAP v10 is a powerful business and personal productivity software application that provides visual organization and access to information for individuals and organizations.Example of usage mind map for progect management
Picture: ConceptDraw MINDMAP v10 :Brainstorming, Mind Mapping for macOS and Windows

UML Block Diagram

Use Case Diagram Taxi Service UML. This sample was created in ConceptDraw DIAGRAM v12 diagramming and vector drawing software using the UML Use Case Diagram library of the Rapid UML Solution from the Software Development area of ConceptDraw Solution Park. This sample shows the work of the taxi service and is used by taxi stations, by airports, in the tourism field and delivery service.UML  Block Diagram
Picture: UML Block Diagram
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Program Evaluation and Review Technique (PERT) with ConceptDraw DIAGRAM v12

Big and complex projects sometimes need some simplification of plans and schedules. That's why Program Evaluation and Review Technique was invented and first implemented in 1958. You can create PERT diagrams effortlessly with ConceptDraw DIAGRAM v12 and share them with your colleagues. Program Evaluation Review Technique (PERT) is a method that is used to assess and analyze projects. PERT is a valuable tool for the project management practice . PERT gives an assessment and analysis of the time needed to the project completion. A PERT chart is a visual tool that delivers a graphical view of a project timeline. It is used to display the sequences and dependences of project tasks necessary to complete a project. ConceptDraw DIAGRAM v12 delivers the possibility to build a PERT along with other diagrams applied to assist management process by using its Seven Management and Planning Tools solution.PERT chart - Request for proposal (RFP)
Picture: Program Evaluation and Review Technique (PERT) with ConceptDraw DIAGRAM v12
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SDL Flowchart Symbols

Drawing the diagrams we try to find in help the powerful software and now we have the ConceptDraw DIAGRAM v12 The ability easily create the SDL diagrams is made possible thanks to unique Specification and Description Language (SDL) Solution from the Engineering Area of ConceptDraw Solution Park. This solution extends ConceptDraw DIAGRAM v12 libraries - SDL Connectors and SDL Diagrams that contain 70 predesigned SDL flowchart symbols.SDL Flowchart Symbols
Picture: SDL Flowchart Symbols
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CCTV Network Example

The following examples cctv network were created in ConceptDraw DIAGRAM v12 diagramming and vector drawing software using the Audio, Video, Media Solution. Using this easily customizable cctv network template you can represent any existing cctv network.Apple TV Airplay CCTV Camera Network Diagram
Picture: CCTV Network Example
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