General Methodology for developing UML models from UI

International Journal on Web Service Computing (IJWSC), Vol.2, No.4, December 2011
DOI : 10.5121/ijwsc.2011.2401 1
General Methodology for developing UML
models from UI
Ch Ram Mohan Reddy1
, D Evangelin Geetha2
, KG Srinivasa2
,
T V Suresh Kumar2
, K Rajani Kanth2
1
B M S College of Engineering, Bangalore - 19, India
2
M S Ramaiah Institute of Technology, Bangalore - 54, India
crams19@yahoo.com, degeetha@msrit.edu, kgsrinivas78@yahoo.com,
tvsureshkumar@msrit.edu, rajanikanth@msrit.edu
Abstract
In recent past every discipline and every industry have their own methods of developing products. It may
be software development, mechanics, construction, psychology and so on. These demarcations work fine
as long as the requirements are within one discipline. However, if the project extends over several
disciplines, interfaces have to be created and coordinated between the methods of these disciplines.
Performance is an important quality aspect of Web Services because of their distributed nature.
Predicting the performance of web services during early stages of software development is significant. In
Industry, Prototype of these applications is developed during analysis phase of Software Development Life
Cycle (SDLC). However, Performance models are generated from UML models. Methodologies for
predicting the performance from UML models is available. Hence, In this paper, a methodology for
developing Use Case model and Activity model from User Interface is presented. The methodology is
illustrated with a case study on Amazon.com.
1 Introduction
System engineering concentrates on the definition and documentation of system requirements in
the early development phase. The preparation of a system design, and the verification of the
system as to compliance with the requirements, taking the overall problem into account:
operation, time, test, creation, cost and planning, training and support, and disposal [21].
Systems engineering integrates all disciplines and describes a structured development process,
from the concept to the production to the operation phase and finally to putting the system out of
operation. It looks at both technical and economic aspects to develop a system that meets the
users’ needs. Hence a new combination of technologies is required to cop up with the new
demand.
1.1 Graphical User Interface.
Over some period graphical user interface have become increasingly dominant, and design of the
external or visible system has assumed increasing importance. This has resulted in more
attention being devoted to usability aspects of interactive system and a need for development of
tools to support the design of the external system. Model and notations are required for
describing user tasks and for mapping these tasks on to user interface.

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The primary purpose of task models is to define the activities of the user in relation to the
system, as a means of uncovering functional requirements to be supported by the system. Task
model focuses on tasks decomposing and/or task flow. A variety of task description methods
have been developed, often involving graphical techniques.
Activity diagram, as supported in UML, falls into the latter category. The user of task models in
interface design is limited by a lack of tools and techniques to support their definition and weak
linkage to visual interface design.
1.1 Importance of UML 2.0
In recent past, many researches and software industry use Unified Modeling Language (UML)
for the conceptual and logical modeling of any system because of the advantages it has. UML
supports both static and dynamic modeling. UML 2.0 is the newer version, which has more
features that can be useful for modeling complex systems also [4],[17].
The standard mechanism that UML provides are adaptable itself to a specific method or model,
such as constraints and tagged values. we use UML to design RMA processes because it
consider an information systems structural and dynamic properties at the conceptual level more
naturally than do classic approaches such as Entity- Relationship model. This approach for
modeling RMA processes yields simple yet powerful extended UML use case and sequence
diagrams that represent RMA properties at the conceptual level.
There are three classifications of UML diagram.
Behavior diagram. A type of diagram that depicts behavioral features of a system or business
process. This includes activity, state machine, and use case diagrams as well as the four
interaction diagrams.
Interaction diagrams. A subject of behavior diagrams which emphasize object interactions. This
includes communication, interaction overview, sequence, and timing diagrams.
Structure diagrams. A type of diagram that depicts the elements of specification that is
irrespective of time. This includes class, composite structure, and component, deployment object
and package diagrams.
1.1 Web Services
The emergence of Web services introduces a new paradigm for enabling the exchange of
information across the Internet based on open Internet standards and technologies. Using
industry standards, Web services encapsulate applications and publish them as services. These
services deliver XML-based data on the wire and expose it for use on the Internet, which can be
dynamically located, subscribed, and accessed using a wide range of computing platforms,
handheld devices, appliances, and so on.
Since early 2006, Amazon Web Services (AWS) has provided companies of all sizes with an
infrastructure web services platform in the cloud. With AWS compute power, storage, and other
services such as gaining access to a suite of elastic IT infrastructure services can be requested.
Using Amazon Web Services, an e-commerce web site can weather unforeseen demand with
ease; a pharmaceutical company can “rent” computing power to execute large-scale simulations;
a media company can serve unlimited videos, music, and more; and an enterprise can deploy
bandwidth-consuming services and training to its mobile workforce [23]. Amazon Web Services
delivers a number of benefits for IT organizations and developers alike, including:

3
• Cost-effective. The uses of AWS have to pay only for what they use, as they use
it, with no up-front commitments. As the Amazon Web Services cloud grows, the
operations, management and hardware costs shrink.
• Dependable. AWS is a battle-tested; web-scale infrastructure that handles
whatever that has been throwing at it. The Amazon Web Services cloud is distributed,
secure and resilient, giving reliability and massive scale.
• Flexible. AWS provides flexibility to build any application, using any platform
or any programming model. The resources can be controlled and fit into your
application.
• Comprehensive. Amazon Web Services gives you a number of services that can
incorporate into your applications. From databases to payments, these services help to
build any great applications cost effectively and with less up-front investment.
1.1 Transformation of UML models into Performance models
Critical aspects of the quality of a software system are its performance. There are many software
engineering methodologies focus on the functionality of the system, while applying a “fix-it-
later” principle to software performance aspects. The system is designed to meet its functional
requirements, by giving less priority to the performance at the later development stages. This
result, lengthy expensive extra hardware, or even redesigns are necessary for the system to meet
the performance requirements. Even with the fine-tuning, there is no guarantee that the system
performance will be appropriate. Several modeling formalisms have been designed to allow
system designers to model the system performance, e.g., queueing networks [6], [14] and Petri
Nets [15 ]& [22].
UML model to incorporate the performance related quality of service (QoS) information to
allow modeling and evaluating the properties of a system like throughput, utilization, mean
response time. So the UML models are annotated according to the Profile for Schedulability,
Performance, and Time (SPT) [16] to include quantitative system parameters in the model.
Markov models, queuing networks, stochastic process algebras and stochastic petrinet are
probably the best studied performance modeling techniques [10]. Markov model is well-
developed numerical modeling analysis techniques; it has the ability to preserve the original
architecture of the system.
Keeping in view of the above discussion we propose a methodology to transform prototype of
User Interface (UI) to UML models. The remaining part of the paper is organized as follows: In
Section 2, related work is presented; Section 3 describes the steps involved in the proposed
Methodology; The Methodology is illustrated with the Case Study on Amazon.com in Section4.
In Section 5, the paper is concluded and the future directions of the work are highlighted.
1 Related Work
The evaluation of system specifications early in the software development lifecycle has
increasingly gained attention from the software engineering community. Early evaluation of
software properties, including non-functional ones, is the important in order to reduce costs in
software development before resources have been allocated and decisions have been made.
Dependability is one example of an important non-functional property and represents the ability
to deliver service that justifiably can be trusted. Discovery of Web Services is of an immense
interest and is fundamental area of research in ubiquitous computing. Web Services are Internet-
based, distributed modular applications that provide standard interfaces and communication

4
protocols aiming at efficient and effective service integration. A Web Service is defined as a
functionality that can be programmatically accessible via the Web [18]. A fundamental objective
of Web Services is to enable the interoperability among different software applications that run
on a variety of platforms [13], [24]. The interoperation has been enabled by the tremendous
standardization effort to describe, advertise, discover and invoke Web Services [3]. Web
Services are increasingly being adopted as a framework to access Web-based applications. Most
of the proposed composition languages for Web Services are based on XML [1], and although
XML-based representations have their advantages as universal representations and exchange
formats, they can be difficult to understand and to write for non-XML experts. Thus, the use of a
graphical modeling language can be very useful to understand the behavior of Systems.
Performance has been recognized as the most considered aspect for the software system
[5].many software performance evolution approaches have been proposed in the literature [19].
UML is the standard for the modeling software systems and it provides standard extension
mechanisms based on additional features which can be used to extend its semantic in standard
and consistent way. UML profile for schedulability, performance and time specification allows
the specification of quantitative information directly in the UML model. [20] Proposed an
algorithm for the software performance modeling based on UML as software description
notation and multiclass QN [7] as the performance model.
The motivation in this [12] is the use of the Unified Modeling Language (UML) [11], and more
specifically the UML Profile for modeling Real Time Systems (RT-UML) profile, as a graphical
modeling language for XML Real-Timed Web Services composition and the verification of
these systems by using Model Checking techniques on Timed Automata. Some web services
workflow patterns and extension in UML to model these patterns are provided in [8]. The
patterns identified are Web Service Call, Loop, Data Transformation and Alternate Services. The
proposed solutions contain UML activity diagrams along with required extensions. The paper
addresses the service composition patterns, but does not provide any feedback mechanism for
refinement. [2] talks about MDA approach for development of Web Services and their
compositions. Business processes are shown by activity diagrams and static structures by UML
class diagrams. Authors have shown mapping from UML to BPEL4WS, WSDL and Java
Platform. The UML is a graphical language for visualizing, specifying, constructing, and
documenting the artifacts of a software-intensive system [9s]. The UML is rather software-
specific and strongly characterized by object orientation. While modeling in systems engineering
is interdisciplinary. The use of UML can easily lead to acceptance problems and
misunderstandings when in interdisciplinary communication. This led to develop our
methodology. All these works are referred to developing UI for software system but not for
system engineering. Hence based on [4] we have proposed our methodology.
1 Methodology
i. Consider the prototype of a User Interface (UI).
ii. Identify UI elements in the selected prototype
iii.Develop the flow diagram of the UI elements
iv. Develop Activity Model
v. Develop Use Case Model
vi. Refine & Iterate.

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The UI elements identified in step 2 are workspaces and functional elements located at the user
interface. These are identified by the designer from the Prototype created at Step1. It is mapping
from logical and physical interface design to use case descriptions which is the focus of the
research reported here.
1 Case Study on Amazon.com
4.1 Prototype of Amazon.com web service
As an illustration of this methodology, consider the web site Amazon.com, and apply the
algorithm for the module Login. The prototype of the login page is given in Fig. 1.
Figure 1. Screen shot of login page of Amazon.com.
4.1 UI elements of Login
In Fig. 2, the UI elements column identifies four workspaces (W1- W4) as being required to
support the user and system activities. It also identifies two functional elements - Sign in using
secure server, Create Account, which are required to support the user tasks. There are two sub-
flows in the figure 2, and one exception flow is shown following invalid user input. The
information to be displayed is shown in each workspace. This is derived from Prototype model.

6
Figure 2. UI Element cluster for the Login use.
4.1 Flow diagram of the UI elements
4.3.1 Main Flow
In the given below figure 3 showing the ‘Main flow of login’, where the first workspace W1
showing to create a account by providing the Name, Email id, Phone number and password.
When it successfully created then workspace W2 showing how to login, for login we have to
provide the Email-id and password. If Email-id and password is correct then it enters in secure
server. The last workspace W4 shows entering in to system and can access the functionalities.
W2
Email Id
Password
W1
Name
Email Id
Phone no
Password
Registratio
n
Sign in
W3
Invalid
Email Id/
Password
Messages
Sign In using
Secure Server
Create Account
W4
Order
Payment
Setting
Digital Content
Personalization

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Figure 3. Main flow of login.
4.3.2 Exception flows
In Fig. 4, the workspace W3 is showing Exception handling when user is logging in. If Email-id
or password or both are Incorrect, then it will show the Exception.
Figure 4. Exception flows of login.
W3
Invalid
Email Id/
Password
W1
Name
Email Id
Phone no
Password
Create Account
W2
Email Id
Password
Sign In using
Secure Server
W4
Order
Payment
Setting
Digital Content
Personalization

8
4.1 Activity Model for login
In Fig. 5, it is showing the activity model for login. When user wants to enter in to the system, if
he is new user then he has to provide the Email-id and fill all the details, then he will enter into
the system. It he is the existing user then he has to provide email-id or password. If email-id or
password or both is incorrect then display error message and again back to login page. If e-mail-
id and password is correct then it moves on to open user form.
Figure 5. Activity model for login
4.1 Use Case Model
In Table 1, it is showing use case specification for login and authenticate. It is showing all the
description about the use case as who is actor, pre-conditions, post-conditions, basic steps of
login, exception handling.
Table 1. Use Case Specification – Login and Authenticate.
Brief Description This use case describes the process by which a user logs into the
System.
Actor User
Pre-Conditions Precondition One
The User must have a valid user name and password.
Precondition Two
The User has access to the system.
Post-Conditions Post-Condition One
The User successfully logs into the system and is re-
directed
to the page.
Post-Condition Two
All and/or any of the login credentials of the User are not valid.
The user is informed that the login are invalid and to try again.
Login and Authenticate
Add New User
Submit
Fill in the form
New user
Enter the e-mail-idEnter E-mail-id & Password
Existing User
Display Error Message
InCorrect Id & Password
Open User Form

9
Basic Steps 1. If new user, the user should enter the credentials and the
system redirects the user to the web page.
2. Already existing user, The user enters and submits his/her
Username and password.
3. The System validates and authenticates the user
Information.
4. The System re-directs the user to the web page.
Exception Flows • The system displays a message to the user indicating
that the user name and/or password are incorrect and to try
again.
• The system displays a message to the user indicating to
enter user name and password.
• The user continues at basic step #2.
• The system displays a message to the user indicating a
communication error.
• The user exits the system.
We have obtained the remaining UI Elements and Activity models, the similar procedure as
given in figures 6, 7 & Table 2 for Search, figures 8,9,10 & Table 3 for shopping cart, figures
11, 12 & Table 4 for online payment and figures 13, 14 for Wish list respectively.
Figure 6. UI Elements Cluster for Search.
Message
SearchW1
All departments
Input text Search
ResultsW2
Showing search results
Choose department to filter results
W3
Showing results
W4
Search text did not match any product
Go Previous Next

10
Figure 7. Activity Diagram for Search.
Table 2. Use Case Specification – Search.
Brief Description This use case describes the process by which user can search for
product.
Actor User
Pre-Condition User must enter the category of search.
User must know what product to search for.
Post -Condition Displays the list of products related to the search.
If searched product is not found display the message product not
found.
Basic Steps User must select the product to search.
System displays the related product list to the user.
View the product and add to the wish list.
Exception Flows System displays a message to the user indicating “your search does
not match any products”
Check Out
Select A Category
Search for a product
View Item
Found
Notfound
Add to the Cart
View the Cart
Update Cart
Yes
Add to the Wish List
No

11
Figure 8. UI Elements Cluster for Shopping Cart.
Figure 9. Add Item to the Shopping Cart.
Search Item
Item found
Add item to Shopping Cart
Wish to add more items
YES
NO
NO
YES
W1
Shopping cart items
Price
Quantity
Subtotal
W2
Items added on
Condition
Shipping duration
Shipping type
See more items
like those in cart
Update
Shopping Cart
Save for
later
Delete
Proceed to
Checkout
Item
Description

12
Figure 10. Edit /Remove Item from the Shopping Cart.
Table 3. Use Case Specification – Shopping Cart.
Brief
Description
This use case describes the process by which user can edit/remove
the item form the cart.
Actor User
Pre-Condition User must be authorized to edit cart.
User must be logged into the system.
User must check for the cart is empty or not.
User must know what to edit in the cart.
Post -Condition Cart will be edited with the changes required by the user.
Basic Steps User must be authenticated to edit the cart.
User must check for shipping cart is empty or not.
If cart is not empty user must select the preferred action to be
taken (Edit/Remove) on the cart.
Action will be performed by the system and communicates the
message to the user.
Exception
Flows
If the cart is empty displays the message that the cart is empty.
Redirect to the login webpage if user had not logged into the
account.
Figure 11. UI Elements Cluster for Online Payment.
View Cart
Is Shopping cart empty
Buy multiple quantities of an item
Remove item from cart
Prefer to buy item later
Change number in the Qty
Update
Delete item
Save item for later
YES YES
YES
NO
NO
YES
NO

13
Figure 12. Activity Diagram for Online Payment.
Table 4. Use Case Specification – Online Payment.
Brief
Description
This use case describes the process by which user can do the
online payment.
Actor User
Pre-Condition User must be authorized to do the online payment.
User must register the card for the payment.
User must choose the mode of payment.
User must choose the type of the card
Post -Condition System display the message payment is successful if payment is
success.
Choose mode of payment
Credit or Debit card Gift cards andPromotionalcodes Amazonstore card CheckingAccount
Add card
Provide Credit or Debit card information
Validate cardinformation
Enter Coupon code Cardexists
Apply for card, provide neccessary info
Enter Checkingaccount information
Proceedtopayment
Complete payment
NO
YES

14
System displays the message unable to proceed if payment is
unsuccessful.
Basic Steps User must be added the product to the shipping cart.
User must choose mode of payment.
User should enter the valid card information.
Enter the amount to be paid.
Redirect to the banking website if information provided by the
user is correct.
Payment will complete.
Exception
Flows
Displays the communication information if the details entered by
the user are incorrect.
Redirect to the login webpage if user had not logged into the
account.
Figure 13. UI Elements Cluster of Wish List.
Figure 14. Activity Diagram of Wish List.
Create a new Wish list
Save list
YES, anyone can search for and see this list
Name the list
Make this list public
Make this list private
NO, only you can see this list
Wish List
Create List
W2
Edit list name
Change privacy
settings
Delete this list
Manage
List
Find List W4
Enter name or
email
Sav Cancel Print list Go
Add to Cart Delete
W1
List name
Make this list public
Or
Make this list private
W3
Title
Price
Desired
Received
Print List

15
Table 5. Use Case Specification – Wish List.
Brief Description This use case describes the process by which user can add products to
the wish list.
Actor User
Pre-Condition User must be authorized to add the items to the wish list.
User must select the items to be added to the wish list.
User need to decide whether to make the list as public or private.
User need to create the list if list does not exist already.
Post -Condition List of items will be added to the wish list.
Basic Steps User must be authenticated to enter the items to the wish list.
Select the item need to be added to the wish list.
Make the list as private/public.
Add the items to the list.
Save the list.
Exception Flows Redirect to the login webpage if user had not logged into the account
4 Conclusion and Future work
In general, developing prototype for software applications is industry practice. Various
methodologies facilitate to predict performance from UML models. Hence, in this paper, we
have proposed a methodology to transform a prototype of UI into UML models, Activity
diagram and Use Case diagram. The user interface designer can predict the performance of a
software system at the early stages. As future work, we propose to develop methodologies to
analyze performance of Web Services from these UML models.
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