The Unified Modeling Language is the industry standard for modeling software-intensive systems.

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Object inheritance and method parameters/return types - Please check my logic

I'm preparing for a test and doing practice questions, this one in particular I am unsure I did correctly: We are given a very simple UML diagram to demonstrate inheritance: I hope this is clear, it ...
3
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3answers
188 views

Understanding UML composition better

The difference between Composition and Aggregation in UML (and sometimes in programming too) is that with Composition, the lifetime of the objects composing the composite (e.g. an engine and a ...
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1answer
153 views

UML Receptions and AcceptEventActions

What shall be the relationship between the receptions of a class (was classifier before Aadaam correction) and the AcceptEventActions in the activity describing the behavior of its instances? I ...
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22 views

In UML is it correct to have an association class with a composition or aggregation relationship?

An example of an association class is given here: http://pic.dhe.ibm.com/infocenter/rsarthlp/v9/index.jsp?topic=%2Fcom.ibm.xtools.modeler.doc%2Ftopics%2Fcassnclss.html Composition and Aggregation ...
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1answer
42 views

What diagram would be the best to describe the situation

I am working on a software integrated with the hardware component. I need to create a simple diagram to express that: Certain activity runs in a cycle (the device continously monitor a temperature) ...
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1answer
63 views

What should be used to diagram an application's internal architecture?

I have an application that has several dependencies, including a Matlab library and a Microsoft Windows Media Player ActiveX control. How would I graphically depict the internal architecture of this ...
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3answers
176 views

Sequence diagrams and the Implementation

In the design phase we create UML Sequence diagrams (in OOD). My understanding is that after creating an Use Case diagram if we need to show further information in terms of time sequence of events of ...
2
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1answer
93 views

How do you show the exception handler in a class diagram?

I have one exception handler class. I want to show this class in the uml -- class diagram. But, I do not know how to represent relationship between class <X> and exception handler class. How can ...
3
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1answer
60 views

What UML diagram should be used for modelling permissions/users/files in Linux?

If I am planning a structure for support testing in Linux, a structure that will contain packages, such files as shell and build scripts, app configurations, DBs, sources, tests and jars for to be ...
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1answer
90 views

How to capture “Display advertisement” use case?

What kind of use case it would be for to "show ad in part of the view"? Who could be the actor to relate with? User or System? As user has no specific goal to see ads, i am wondering what is the best ...
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1answer
73 views

Should state machine with synonym states be shown explicitly?

I am new to state machine modeling and while trying to model a system, I have a question. An example will explain it better: Considering a system that does calling (probably a customized cell phone ...
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3answers
206 views

is it valid that a state machine can have more than one possible state for some transition?

I have a requirement for a workflow which I am trying to model as a state machine, I see that there is more than one outcome of a given transition(or activity). Is it valid for a state machine to ...
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86 views

UML Class Diagram: Abstract or Interface?

I am modeling a class diagram and have spotted an opportunity to simplify it slightly. What I want to know is, would this it be better to implement an abstract class or an interface? The scenario is ...
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2answers
97 views

Buyer vs Seller on UML Model

I'm modeling an Online Classified System where, naturally, who sells also can buy and vice-versa. The question is: should I have two different Actors, Buyer and Seller or I could have, say, an actor ...
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2answers
601 views

Mapping between 4+1 architectural view model & UML

I'm a bit confused about how the 4+1 architectural view model maps to UML. Wikipedia gives the following mapping: Logical view: Class diagram, Communication diagram, Sequence diagram. Development ...
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2answers
328 views

Activity diagram, can merge node have more than 1 output?

There is a simple system, that allows users to do 4 things: ADD, EDIT, DELETE, PRINT data. I am due to model it (I'm entirely new to UML activity diagrams) and from notation, I dont understand ...
2
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2answers
2k views

how to express alternative flows in activity diagram

I want to express the below events in an activity diagram: An alternative flow, such as "at step x of basic flow, user clicks cancel instead of ok". An alternative entry to the use case, such as ...
2
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3answers
750 views

Do activity diagrams always end in one endpoint?

For example an activity diagram for a simple program: Get User data. If User Exists DO something, ELSE do nothing. End. I often see diagrams with multiple endpoints but also with just one. Should ...
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2answers
2k views

What is a Package Diagram? and What is a Sequence Diagram? [closed]

In many interviews I've been asked this question. What is a Package Diagram? and What is a Sequence Diagram? and difference between Package Diagram and Sequence Diagram. Thanks in Advance. Edit ...
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0answers
31 views

How to model an optional input to an activity?

I am constructing a UML 2.0 activity diagram. The activity is to evaluate data from a usability study of a prototype. It can optionally end with just getting the user satisfaction results. But if the ...
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3answers
118 views

How to consider the login function collecting requirements of an application? is it a user requirement?

I am working on an application that expected to the user logs in when the application is started (as for example it is in Skype: the user open the application and appear to him a login mask when he ...
3
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1answer
79 views

Access items of a container with a pattern

I've two C++ classes with a relation: a container class which has a list of items. For example a library has got many books. The classes are the library and the book. Now from the external world I ...
2
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0answers
43 views

How deep is enough to represent an algorithm in UML sequence diagram?

I have three simple classes. LoginController, UsersCatalog and User. UsersCatalog has an array of User. I have to represent a simple process of login. LoginController has a method login(username, ...
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0answers
41 views

How to implement 'use case control' object in (iOS) MVC?

In an MVC architecture pattern (for e.g., in iOS) there is a controller per view. In UML there is a concept of having Control object per use case to encapsulate an use case, which may span more than ...
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1answer
42 views

UML Diagram for Locations of Components

I am about to deploy a new project that will have different components being deployed on different servers and in different web sites/technologies/etc. I was just wondering what would be the best way ...
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2answers
99 views

How to handle long method names in sequence diagram?

I have a C# application that is developed with VS 2010 pro. The ultimate version would have a sequence diagram feature. Since I will "create" my sequence diagram manually, how do I deal with quite ...
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2answers
104 views

UML class diagram: how to annotate observer-subject relationship?

How can I annotate in a UML class diagram that an instance of ClassA is registered as an observer of an instance of ClassB? (Both implement the appropriate interfaces). This doesn't really belong in ...
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1answer
144 views

UML class diagram - instantiation dependency relationship: who depends on who? [duplicate]

I did some reading on the <<instantiate>> relationship in UML class diagrams. It's a dependency relationship where one side depends on the other. However, I'm not sure who depends on who: ...
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1answer
96 views

How to depict Import a file action in the Sequence diagram

Everyone says sequence diagrams are so easy but I just cannot figure this out. Basically user clicks on an 'Import from temp folder' button, the program opens a window with a list populated with ...
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10answers
967 views

How useful is UML if you are a developer working alone in a project [closed]

How useful is UML if you are a developer working alone in a project?
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1answer
69 views

What's the difference between model for test and model for development?

What's the difference between model for test and model for development? Is it that the model for test contains only what we should test? Do we use the same diagrams in model for test and model for ...
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2answers
452 views

UML class diagram notations: Differences between Association, Aggregation and Composition

I'm confused about some of the notations of UML class diagrams. Pretty sure I know what Association means. Any relationship between instances of two classes, where an instance of one class needs to ...
0
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1answer
101 views

I want to draw class diagram, but I don't know how to put server and database inside? [closed]

I just started to draw class diagram, I think it is based on 3-tie architecture. I have mobile application, servers, database, and web interface. But I do not know if it should put the server in? I ...
2
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1answer
170 views

UML class diagrams: How to show dependency

Please consider a program with four classes: Class A, B, C and D. Classes A and B are subclasses of abstract super-class C. Class D is dependent on C. Meaning: It holds a C objectOfTypeC field. As ...
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1answer
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Should I label class diagram variables as private or public?

In my program, I have several class variables whose access specifier is known as private package. The default accessor specifier in Java is known as private package where it is accessible within the ...
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1answer
226 views

My UML class diagram is too complicated, what should I do?

Classes have 10-20 links with one another and you can't see anything in that mess of a diagram Unfortunately we finished coding already and if we change the class diagram we have to redo the whole ...
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3answers
183 views

How important is it to learn UML for an OO developer? [closed]

When studying OOP by myself I often encounter UML class diagrams. I understand them, but don't completely know how to write them. Meaning, I don't entirely know what each kind of arrow means, and ...
3
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3answers
273 views

When presenting a software design to upper management

I'm presenting a software design for approval today and as I'm going through the hundreds of pages of design documentation, cherry picking what's important, I'm unsure if I should start with the ...
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1answer
38 views

Compatibility between Class Diagram and Sequence Diagram

Do the message being passed between objects in Sequence Diagram match with the methods in Class Diagram?
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3answers
127 views

Should we include external systems in Class diagram?

I want to draw a class diagram that shows the following for an application: An external content management system that publishes some news items. The class that represents the news item in my ...
2
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2answers
183 views

Should I always start with UML as a good practice when designing classes?

I am in the middle of creating a Bundle for PHP application based on Symfony 2. I want the bundle to be clear and good designed, so I constantly move and refactor code, rename methods, reorder ...
6
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4answers
334 views

What modelling technique do you use for your continuous design? [closed]

Together with my teammates, I'm trying to self-learn XP and apply its principles. We're successfully working in TDD and happily refactoring our code and design. However we're having problems with the ...
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2answers
305 views

How to indicate that a class might implement an interface?

Say I have a class User and an interface Administrator. Some users are administrator and can thus implement the interface. Most aren't, however, so it's false to say that "User implements ...
5
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5answers
1k views

Limitations of UML? [closed]

I'm currently studying for an examination and one of the sample paper questions is to discuss the limitations of UML. Most of the material I'm finding on the net is relating to a specific UML ...
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7answers
5k views

OO Design related questions in technical interviews

I've been attending quite a few interviews recently and have been asked by companies to answer "design a [insert model]" questions more than a few times. Is this normal in the industry nowadays? ...
2
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3answers
237 views

Is UML a good way to shortly and simply explain a concept? [closed]

I was recently in a job interview that was mostly technical. One of the things that stood out was my difficulty explaining ideas and concepts. During the interview I decided not to use UML to ...
2
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2answers
148 views

How can I indicate if an object operates with another one in an UML class diagram?

Suppose I want to draw a class diagram of a DAO and an Entity. The DAO is used to load instances of the Entity from the database. How can I represent this relationship on my class diagram? Is this ...
5
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1answer
205 views

How to display in compositional relationship that the item knows about the container?

I'm drawing a class diagram and noticed that sometimes I got a relationship (composition or aggregation) where the item uses the container, and sometimes not. What is the visual difference in a ...
3
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3answers
2k views

How do you annotate instantiation in UML class diagrams?

Given this pseudo code: class B { } class A : B { int val; }; alpha = new A(); What arrow do I draw between alpha and A in a UML class diagram? Is this even something UML is meant to do? ...
2
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2answers
404 views

Package diagram for an MVC patterned project?

We are required to make a package diagram for our senior project. Since our project uses MVC patter design, we created an MVC class diagram, now, our problem is in creating the package diagrams from ...