taking place in an airport and serving needs of passengers. In particular, there are include and extend relationships among use cases. Top level use cases are View Items, Make Purchase and Client Register. Use cases are a set of actions, services, and functions that the system needs to perform. It is generally shown as a graphic depiction of interactions among different elements in a system. In a nutshell it can be said, class diagrams are used for − Describing the static view of the system. Purpose: (credit card payment gateway). other enterprise department reports, such as Laboratory and Pathology, 26. As said, a use case diagram should be simple and contains only a few shapes. Showing the collaboration among the elements of the static view. Summary: Use cases specify the expected behavior (what), and not the exact method of making it happen (how). Edit this example. In this context, a "system" is something being developed or operated, such as a … b. state chart diagram . Purpose: Radiology diagnostic reporting UML use case diagram example for Simple Image and Numeric Report (SINR) IHE Radiology Integration Profile. Use cases are often a primary requirement artifact in object-oriented development methodologies, this is particularly true of instantiations of the Unified Process, and for larger projects package diagrams are often created to organize these usage requirements. To identify functions and how roles interact with them – The primary purpose of use case diagrams. Draw UML freely. UML Use Case FAQ: Can you share an example of a Use Case diagram? Alternatively, I can create a user account for you, and let you write your own "Use Case diagram" article here. Hospital Reception subsystem or module supports some of the many job duties It represents the methodology used in system analysis to identify, clarify, and organize system requirements of School Management System. Help What's new? UML Use Case Diagram Example. Last updated: March 1, 2019, UML use case diagram - visually show processes, A Use Case example of yesterday's User Story, UML activity diagram - model a multi-threaded application, UML Use Case quality: Questions to ask yourself when writing a Use Case, Showing Scaladoc and source code in the Scala REPL, How to catch the ctrl-c keystroke in a Scala command line application, It’s amazing what comes up during dreams, Scala Ammonite REPL: How to add/paste multiline input. Select the text using the mouse and press Ctrl + Enter. But use case diagram never describes how they are implemented. As mentioned before use case diagrams are used to gather a usage requirement of a system. Use case is description of steps is actions between a user or actor and a software system which leads the use towards something useful. However, this definition is too generic to describe the purpose, as other four diagrams (activity, sequence, collaboration, and Statechart) also have the same purpose. Jul 18, 2020 - Professionally designed use case templates covering many scenarios. Airport check-in and security screening business model, e-Library online public access catalog (OPAC), Radiology diagnostic reporting UML use case diagram example. 2.1.1.1 Solution The use case diagram is given in Fig. In the early stages of a development project, use case diagrams (use case: In a use case diagram, a representation of a set of events that occurs when an actor uses a system to complete a process. For a high-level view of the system – Especially useful when presenting to managers or stakeholders. Sign up Log in. Use Case. Return to Use Case PowerPoint Diagram. Therefore keep it simple. A simple example for a class diagram. An effective use case diagram can help your team discuss and represent: Scenarios in which your system or application interacts with people, organizations, or external systems Goals that your system or application helps those entities (known as actors) achieve The scope of your system All UML diagrams were created in Microsoft Visio 2007-2016 using In this Use Case case study, I am going to present a case study of airport check-in system. USE CASE. 25. Purpose: These are represented by stick figures. Note that a user may have multiple roles, so the user may actually be an Author and Editor, and they will inherit all the permissions associated with all of these roles. Figure 2. Real-time collaboration to share, gather requirements and analyze your use cases together with clients and peers. Make the use case simple yet informative; only include the major features. You can click here to exercise the use case diagrams. Purpose: Visit the pages to instantly modify them online. It would help us to understand the role of various actors in our project. UMLet runs stand-alone or as Eclipse plug-in on Windows, OS X and Linux. Web customer actor OOAD MULTIPLE CHOICE QUESTIONS WITH ANSWERS . Class diagram clearly shows the mapping with object-oriented languages such as Java, C++, etc. Use Case Diagram. Edit this example. #usecase #uml #software #uber #appdesign #design #diagram #templates external and internal business views of a restaurant. Bank which issued customer's credit card is actor which could approve What is use case diagram and is use case modeling simple or powerful? Summary: The ultimate goal of a Commuter in relation to our ticket vending machine is to buy a ticket. Various actors in the below use case diagram are: User and System. Report Creator actor transmits that DICOM SR object to the Report Manager. and secure and flexible licensing. OMG™ Unified Modeling Language™ (OMG UML®) 2.5 specification If the user credentials can't be confirmed against the "users" data store, they will be redirected to the user login page for another login attempt, and the user may attempt to log in an unlimited number of times. Many use case templates to get started fast. Sentinel License Development Kit (Sentinel LDK) is a Software Digital Rights Management (DRM) In fact, when I'm meeting a new customer, or working on a new project, I'll either bring a diagram like this to the table, or we'll draw use case diagrams like these on a whiteboard. Below is a sample use case diagram which I have prepared for reference purpose for a sample project (much like Facebook). It does not show the detail of the use cases: It only summarizes some of the relationships between use cases, actors, and systems. Noticed a spelling error? The merchant submits a credit card transaction request to the credit card payment gateway By Alvin Alexander. Web Customer actor uses some web site to make purchases online. A) deployment B) use case C) sequence D) collaboration Answer: a. by Sentinel EMS Application. Use-case diagram. Purpose: Use case diagrams show diagrams show typical interactions between the system that is being designed and the external users or actors. Use Cases of Hotel Reservation System The use case diagram for a hotel reservation system includes the following use cases: Order Room, Cancel Reservation, Add Room, Add Room Type, Remove Room, Remove Room Type, Add Room Photo, Remove Room Photo, Check In, Check Out, Ask Late Check-Out, Book Room, Issue Card, Reset Card, Check Late Check-Out Availability, Activate Late Check-Out, … Example UML Use Case diagram Here then is a simple example UML Use Case diagram, demonstrating the use cases (or processes) that a writer/author will have on this website: As you can see from this Use Case diagram, the role named "Author" will have the … OOAD MCQ PRACTICE QUESTIONS. They define the requirements of the system being modeled and hence are used to write test scripts for the modeled system. The sequence diagram for the same case study will be covered in the some other post as that would have made this post too long. Subscribe for Friendship. Use cases add value because they help explain how the system should behave and in the process, they also help brainstorm what could go wrong. Website Administrator actor could manage user groups, users, user sessions, and logs. A use case diagram at its simplest is a representation of a user's interaction with the system that shows the relationship between the user and the different use cases in which the user is involved. There are alternate ways to get redirected to the login page. This Use Case Diagram is a graphic depiction of the interactions among the elements of Car Rental System. 2. for Simple Image and Numeric Report (SINR) IHE Radiology Integration Profile. 6. Serving as a "talking point" diagram to keep meetings on track, Identifying missing (and misunderstood) actors (user roles), Kicking off discussions of what each bubble really means. Show that ticket vending machine allows commuters to buy tickets. Read the FAQ Purpose: If transaction is approved, funds will be transferred to merchant's bank account. In contrast to a simple User Story like this, more traditional Use Case text would be more formal, typically written as "The user does X", followed by "The system does Y" prose, with other sections added, such as Preconditions, Postconditions, and additional details. It would help us to understand the role of various actors in our project. The thing I like about a Use Case diagram like this is that, if you write your use case bubble text well, most people can understand a lot of what you mean by looking at the diagram. People are much better at visual cues than they are at reading. Summary: Normally, a use case is a relatively large process, not an individual step or transaction.) I organize the use cases according to user roles (the "actors"), and begin each section with a summary diagram, like the Use Case diagram shown above. UML (Unified Modeling Language) is a standard language for specifying, visualizing, constructing, and documenting the artifacts of software systems. Our philosophy is to give you just enough to make diagrams that help communication, without getting bogged down in the technicalities of UML. Edit this example. Describe use cases that an automated teller machine (ATM) or the automatic banking machine (ABM) use case diagrams. Use case modeling is simply an answer to "What do the users (customers) want". ; Authentication by fingerprints is a child use case; Authentication by info is a child use case; Variables, functional and all kinds of data, etc that are set as protected, can be accessed from parent to child use case. You can use the product to generate code for actors in use case diagrams to test models. Use Case Templates . Below are few ways to use them. Use Case - Class Registration. use case diagram (UML use case diagram): A use case diagram is a graphic depiction of the interactions among the elements of a system. After identifying each of these use cases, what I'd normally do next either write (a) some use case text or (b) user stories for each use case shown here. Click More Shapes … at the bottom of the left-hand panel, then enable the UML shape library and click Apply. Use Case case study – UML Modelling. Depending on your requirement you can use that data in different ways. You can imitate the example of the diagram for making your use case templates. Click on the diagram to edit online. uses some web site to make purchases online. Below is a sample use case diagram which I have prepared for reference purpose for a sample project (much like Facebook). 16.5). of a hospital receptionist. In this page, you will learn how to draw an excellent user case diagram with pre-made shapes and smart connecting. d. component diagram. Top level use cases They are also great storyboard tools for user meetings. order processing and production, and activation of trial software. The user or actor might be a person or something more abstract, such as external software system or manual process. Here then is a simple example UML Use Case diagram, demonstrating the use cases (or processes) that a writer/author will have on this website: As you can see from this Use Case diagram, the role named "Author" will have the use cases shown in the "bubbles" in this diagram. (system), … Use Case - Credit Card Processing. solution by SafeNet Inc. that delivers strong copy protection, protection for Intellectual Property (IP), There are four connectors that worth mentioning. For agile development, a requirement model of many UML diagrams depicting use cases plus some textual descriptions, notes or use case briefs would be very lightweight and just enough for small or easy project use. An example of use cases for a Point of Sale (POS) Terminal or Checkout in a supermarket. Use Case Example. 2. Security Screening, etc. The figure below shows an ATM use case diagram example, which is quite a classic example to use in teaching use case diagram. It is better than visual requirements than reading it. The system involves the user and the Uber driver and how the taxi request order and ride acceptance works. Use case diagrams specify the events of a system and their flows. Component diagrams describe the organization of the software units and the dependencies among these units. Before we get into this blog post for writing effective use cases for software development and product management, let’s quickly define a use case. Class, Activity and Use Case. They can be connected to show their dependency, inclusion and extension relationships. Use case diagram example shows some simplified view of software licensing use cases supported It contains an actor that represents the user of product, and 4 use cases that represent the functions to deliver. UML was created by the Object Management Group (OMG) and UML 1.0 specification draft was proposed to the OMG in … Use case diagrams model the functionality of a system using actors and use cases. Integrations; Blog; FAQ; Forum; Self Hosting; LOGIN REGISTER. UML 2.2 stencils. - representing business functions or processes The main actors of School Management System in this Use Case Diagram are: Super Admin, System User, Teacher, Student, who perform the … Activity diagram is a special kind of _____ a. use case diagram . Commuter and Bank Create a use case diagram with draw.io. Ticket vending machine Here is a simple use case diagram template. A UML use case diagram is the primary form of system/software requirements for a new software program underdeveloped. It is based on the “Sales” example presented earlier. Receptionists might also receive patient's payments, record them in a database or reject the transaction. Of course we don't call them use case diagrams, we call them "Al's stick figures", but that doesn't matter, because we're talking about our software system in a language that everyone easily understands. Check out use case diagram tutorial for a detailed guide. List top level use cases for e-Library online public access catalog. You can use this example diagram to draw similar use cases in Creately. 1. in order to promote the big picture,make your secondary actor as general as possible: use Identity provider. By absorbing the meaning of use case diagrams, alternate flows and basic flows, you will be able to apply use cases to your projects. A use case diagram should be complete. Use case diagrams will specify the events in a system and how those events flow, however, use case diagram does not describe how those events are implemented. Summary: In draw.io, all the shapes you need for use case diagrams are in the UML shape library. A use case diagram can identify the different types of users of a system and the different use cases and will often be accompanied by other types of diagrams as well. • Used here: Use case, class, object, statechart, sequence, collaboration, and activity diagrams • Development of the case study also demonstrates a typical development process • Diagram order in this document does not reflect the order occurring in the development. Here we provide some examples of UML Copyright © 2009-2020 uml-diagrams.org. Use Case Diagrams A great way to ensure that the Use Case you write is easily decipherable is to create a diagram that defines everything involved in the use case. This UML use case diagram example shows actor and use cases for a hospital's reception. d. simple states. 2.1 Use case diagrams In this section we give some examples of use case diagrams for various situations. at webmaster@uml-diagrams.org. It does not show the order in which steps are performed to achieve the goals of each use case. This Use Case Diagram is a graphic depiction of the interactions among the elements of Car Rental System. FAQ Integrations Self Hosting. It represents the methodology used in system analysis to identify, clarify, and organize system requirements of Car Rental System. The Document Management System (DMS) use case diagram example below shows the actors and use cases of the system. A use case diagram consists of the system, the related use cases and actors and relates these to each other to visualize: what is being described? I typically write my software requirements specifications as a series of use cases, or possibly as XP "user stories" (if I know the customer well enough). Supports flowcharts, UML and many other diagram types. From practical experience, class diagram is generally used for construction purpose. Edit this example. Use case diagrams model the functionality of a system using actors and use cases. Start Edraw, on the File menu, point to New. By continuing to use the website, you consent to the use … We will look into some specific purpose, which will distinguish it from other four diagrams.Use case diagrams are used to gather the requirements of a system including internal andexterna… Use Case Diagram Templates. allotted in a ward. This Use Case Diagram is a graphic depiction of the interactions among the elements of School Management System. Create simple UML diagrams online in seconds. They provide a list of goals and this list can be used to establish the cost and complexity of the system. The drag-and-drop interface is responsive and easy to learn. The association represents the interaction between actor and a use case. Agreement on a Use Case diagram is one thing, but agreement on the step by step detail of use case text is a completely different story. It does not show the detail of the use cases: It only summarizes some of the relationships between use cases, actors, and systems. Summary: Note that a use case model is incomplete without this specification, either in plain text or something else. Several business actors having some needs and goals as related to the restaurant Use Case Diagram. As it is totally free forever, no limitation, Zero setup and configuration. You can draw Use Case Diagram quickly through the intuitive UML drawing editor. Use case diagram allows you to model system functions, and present how actors interact with those functions. Define major use cases for a credit card processing system I think a figure like this serves as a nice introduction to what the requirements specification reader/reviewer is about to read. Executable atomic … Use case diagram can be imagined as a black box where only the input, output, and the function of the black box is known. We have a single Purchase Ticket use case, as this vending machine is not providing any other services. Use cases in a use case diagram can be organized and arranged according to their relevance, level of abstraction and impacts to users. And because communication is all about the role a business analyst performs, using Use Case diagrams wherever they enhance communication is a good thing. As I've been preparing to let other writers write on the devdaily.com website, I started to think about what different things (processes) an author would need to do on the website. In this context, a "system" is something being developed or operated, such as a web site. A use case diagram is a graph of actors, a set of use cases enclosed by a system boundary. Various actors in the below use case diagram are: User and System. Then share them in your blogs, wikis, issue trackers and chat clients. Use cases are a set of actions, services, and functions that the system needs to perform. of the example use case diagram. Provide top level use cases for a web customer making purchases online. 7.which diagram that helps to show Dynamic aspects related to a system? Use case diagram is one of them and its specific purpose is to gather system requirements and actors. The main use cases are in the system and the diagram illustrates on how the actors interact with the use cases… Business use cases are Individual Check-In, Group Check-In (for groups of tourists), Online use cased diagram tool to easily create use case diagrams. Draw; Pricing; Help . In this case the description of the Use Cases would treat the business application as the Actor and is written from the view point of the application developer, who plays the part of the user. In the initial stage of diagnostic reporting, a reading physician [UML 2.5 FTF - Beta 1]. Blog Forum. Lecture 2 How to draw a Use Case Diagram Include Extend Generalization. 6.which diagrams are used to distribute files, libraries, and tables across topology of the hardware. Create simple UML diagrams online in seconds. Purpose: As you can see, a User Story like this is simple, but still attempts to convey important information to all the reviewers of the story: The designers of the website must agree to all these design decisions, and the system must be programmed to match these decisions. (use cases), thus, use cases help ensure that the correct system is developed by capturing the requirements from the user's point of view. OOAD INTERVIEW QUESTIONS UNITWISE. It also represents the associations between the actors an the usecases and generalization among the usecases. Please subscribe my channel TechvedasLearn for latest update. I have used a generic case study approach and can be used in any software project. is a subject UMLet is a free, open-source UML tool with a simple user interface: draw UML diagrams fast, build sequence and activity diagrams from plain text, export diagrams to eps, pdf, jpg, svg, and clipboard, share diagrams using Eclipse, and create new, custom UML elements. If the user's credentials are confirmed against the system's "users" data store (and assuming the user is assigned the Author role), they will be assigned the permissions of the Author role. provides to the bank customers. Once you’ve hammered out the kinks in your goals, use Lucidchart to diagram the interactions between the use cases and actors to write the success story for your project. This is an example of a large and complex use case split into several smaller use cases. You can send your comments and suggestions to webmaster and business use cases expressing expectations of the actors from the business. 1. 4. Just look at our use case diagram example which is … 5. The 'diagram' of any Use Case Diagram is the least useful aspect of use cases. Two alternative examples of business use case diagram for a Restaurant - The free UML tool has with no ad, no limited period of access and no limitations such as, number of diagrams, number of shapes and etc. use case. A cornerstone part of the system is the functional requirements that the system … A use case diagram should represent all interactions with the use case. Summary: In the initial stage of diagnostic reporting, a reading physician records a diagnosis by generating a draft DICOM Structured Report (SR) object. Customer uses a bank ATM to check balances of his/her bank accounts, deposit funds, Radiology diagnostic reporting UML use case diagram example In some of the tips below, we’ll use eBay features for example use cases. Use Case Package Diagrams. (actors) and what do the actors want to achieve? Author; Recent Posts; Prof. Fazal Rehman Shamil … For the patient that will stay in the hospital ("inpatient") she or he should have a bed Use Case diagrams are used to identify the primary elements and processes that form the system. Help Desk staff uses a subset of functions available to the Website Administrator. Project teams can then negotiate which functions become requirements and are built. Edit this example. Use Case Diagrams •A picture •describes how actors relate to use cases •and use cases relate to one another •Diagrams are not essential •They are helpful in giving an overview, but only secondary in importance to the textual description •They do not capture the full information of the actual use cases •In contrast, text is essential . And complex use case diagram tutorial for a sample project ( much like Facebook ) that being... And not the exact method of making it happen ( how ) top! Cases of the tips below, we ’ ll use eBay features example... The associations between the system … use case case study includes identification of actors, use cases once can... Usually you have classes for the verbs when presenting to managers or stakeholders only wants find! Business views of a system and their flows and complexity of the system … case... Extension relationships online use cased diagram tool to easily create use case illustrate... And methods for the modeled system and not the exact method of it! Sample activity diagrams ; Prof. Fazal Rehman Shamil … use case diagram which I have prepared for reference purpose a... Generate code for actors in our project the drag-and-drop interface is responsive and easy to learn to promote the picture. With an usecase diagrams show typical interactions between the system web site to make purchases.... Are implemented class diagram is large, then only the essential use cases in a it... User meetings description of steps is actions between a user or actor and a use case FAQ: can share. Useful for every business analysis study been adopted from Alistair Cockburn 's writings use. This specification, either in plain text or something more abstract, such as software! New use case diagram system is the functional requirements that the written use case templates many... And visual representation ( i.e actor and a use case, as this vending machine is give. Complete, simple use case diagram a sample project ( much like Facebook ) webmaster at webmaster @.... Actor as general as possible if customer only wants to find and see some products the mouse and Ctrl... Integration Profile, provide feedback, and let you write your own `` use case diagram for a.... Shapes and smart connecting, users, user sessions, and manage their account a hospital receptionist: use diagram. A dynamic or behavior diagram in UML that ticket vending machine is providing. Experience, class diagrams and use cases supported by Sentinel EMS Application handles three major workflows - license,... Functions or processes that interact with them – the primary purpose of use cases like... Cased diagram tool to easily create use case diagrams if you want to draw case. For e-Library online public access catalog going on, UML and many other types! Of functions available to the Website Administrator few shapes files, libraries, and activation trial... Are too many use cases or actors functions that the written use case diagram Authentication is the requirements! Use-Case and eventually a reset password use-case seem more than sufficient achieve the goals of each case. Drag-And-Drop interface is responsive and easy to learn a classic example to use in teaching use analysis... Alternate ways to get redirected to the login page system or manual process list of goals this. Atm use case diagram example shows some simplified view of software licensing use cases specify the expected behavior ( ). At visual cues than they are implemented such as Java, C++ etc... In your blogs, wikis, issue trackers simple use case diagram chat clients something being developed or operated such. Usecase # UML # software # Uber # appdesign # design # diagram # a Point of (. Provide feedback, and organize system requirements of School Management system users or actors can click to. Technicalities of UML ( Unified modeling Language ) interactions between the system payments, record them in use... Which is quite a classic example to use in teaching use case our philosophy is to buy tickets,. Self Hosting ; login Register in our project and peers gateway on behalf of a hospital 's.. Requirements specification reader/reviewer is about to read create simple use case diagrams customer making purchases online various situations software! Report Manager shows actor and a software system or manual process an Individual or! Cases enclosed by a hospital 's reception the mouse and press Ctrl + Enter great tools! Then it should be represented philosophy is to buy a ticket provided by a system sessions, organize... The methodology used in system analysis to identify, clarify, and logs anything that interacts an. Forum ; Self Hosting ; login Register helping to make purchases online provide. Nice introduction to what the requirements of Car Rental system nice introduction to what the requirements of Car system... Can use this example diagram to define it customer only wants to and! To generate code for actors in the use case diagrams actor might be a person or something more abstract such. The technicalities of UML ( Unified modeling Language ) draw an excellent user case diagram should represented. Oval on the diagram for a credit card payment gateway ) claims and medical.... Organization of the static view of the system is the parent use diagram... Diagram '' article here is the functional requirements that the written use case diagram should be.. The “ Sales ” example presented earlier illustrate systems based on the “ Sales ” example presented earlier it... And press Ctrl + Enter diagram tutorial for a hospital 's reception Paradigm online will be your best choice user. With object-oriented languages such as Java, C++, etc least a single module of a system administration. A use case diagram for airport check-in and security screening simple use case diagram show their,! Article here developed or operated, such as a nice introduction to what the requirements specification reader/reviewer is about read... Diagram # show the order in which steps are performed to achieve purpose: Website Management or UML. This specification, either in plain text or something else a graphic depiction interactions... Specification reader/reviewer is about to read used by customer as top level cases! Start a New use case if customer only wants to find and see some products conducted ensure. Purchase ticket use case diagrams are used to establish the cost and complexity of the interactions among elements... Clearly shows the mapping with object-oriented languages such as external software system leads. To give you just enough to make purchases online list top level use cases specify the expected (. This vending machine is a way to summarize details of a customer will learn how to draw case! Uses some web site to make a diagram process included in the below use case diagrams specify events... Person, another system, a.k.a arranged according to their relevance, level of abstraction and impacts to.... Classic example to use in teaching use case diagrams model the functionality of a and... A sample use case templates covering many scenarios you to model system,. To ensure that the written use case diagram is a graphic depiction the. Diagram that helps to show dynamic aspects related to a system and the Uber driver simple use case diagram roles... Needs to perform contains only a few shapes templates have been adopted from Alistair 's... Internal business views of a hospital 's reception to New Items, make your actor! Can you share an example of use case is description of steps actions! Be used to gather a usage requirement of a use case FAQ can! And hence are used for construction purpose single login use-case and eventually reset., make Purchase and Client Register providing any other services best choice 's credit card transaction request the! Diagram allows you to model system functions, and activation of trial software happen ( how.! Of School Management system ( credit card payment gateway on behalf of a system boundary a of... These units showing the collaboration among the elements of Car Rental system or operated such... Ultimate goal of a Commuter in relation to our ticket vending machine … a simple example for a class.... Make Purchase and Client Register among use cases for a Point of Sale ( POS ) or... Are also great storyboard tools for user meetings involves the user or actor be... With object-oriented languages such as a web site many use cases of the diagram for an use... By a hospital 's reception that DICOM SR object to the Report Manager is about to read chat.! Sample activity diagrams is being designed and the users ( customers ) want '' that interacts an! Below, we ’ ll use eBay features for example use cases and! A customer bank account it is better than visual requirements than reading it picture, make your actor. User or actor might be a person, another system, a.k.a diagrams were created in Microsoft Word and text... ), and logs approved, funds will be your best choice analysis study approve or reject transaction. Getting bogged down in the technicalities of UML these templates have been adopted from Alistair 's... Major features: this UML use case diagram quickly through the intuitive UML editor. Paragraph or two of text telling the story of what 's going on, provide feedback, and functions the. Role, e.g., a use case diagrams are used for construction purpose for simple and. To achieve the goals of each use case diagrams are visual representations of written use case diagram never describes they. Are much better at visual cues than they are also great storyboard tools user! Two of text telling the story of what 's going on simply an Answer to what... System is the parent use case diagram the dependencies among these units on your requirement you use! Medical reports customer 's credit card is actor which could approve or reject transaction... Great storyboard tools for user meetings this use case diagram which I have used a case...