5.4 Activity diagramActivity diagram is UML behavior diagram which shows flow of control or object flow with emphasis on the sequence and conditions of the flow. The actions coordinated by activity models can be initiated because other actions finish executing, because objects and data become available, or because some events external to the flow occur. Activity diagrams are graphical representations of workflows of stepwise activities and actions with support for choice, iteration and concurrency.5.4.1 ConstructionActivity diagrams are constructed from a limited number of shapes, connected with arrows. The most important shape types:

Rounded rectangles represent activities;

Diamonds represent decisions;

Bars represent the start (split) or end (join) of concurrent activities;

A black circle represents the start (initial state) of the workflow;

An encircled black circle represents the end (final state).Activity diagram of m-banking

User first has to register himself to get the following function:

Check Balance

Account statement

Inter Bank balance transfer

Intra Bank balance transfer

Credit transfer

Utility bill payment

User can also perform pin alteration operation and can also deactivate his/her registered account.

Figure 5.5: Activity diagram of m-banking5.5 Sequence DiagramUML sequence diagrams model the flow of logic within your system in a visual manner, enabling you both to document and validate your logic, and are commonly used for both analysis and design purposes. Sequence diagrams are the most popular UML artifact for dynamic modeling, which focuses on identifying the behavior within your system. Other dynamic modeling techniques include activity diagramming, communication diagramming, timing diagramming, and interaction overview diagramming.Sequence diagrams are typically used to model:

A. Usage scenariosA usage scenario is a description of a potential way your system is used. The logic of a usage scenario may be part of a use case, perhaps an alternate course. It may also be one entire pass through a use case, such as the logic described by the basic course of action or a portion of the basic course of action, plus one or more alternate scenarios. The logic of a usage scenario may also be a pass through the logic contained in several use cases. For example, a student enrolls in the university, and then immediately enrolls in three seminars.

B. The logic of methodsSequence diagrams can be used to explore the logic of a complex operation, function, or procedure. One way to think of sequence diagrams, particularly highly detailed diagrams, is as visual object code.

C. The logic of servicesA service is effectively a high-level method, often one that can be invoked by a wide variety of clients. This includes web-services as well as business transactions implemented by a variety of technologies such as CICS/COBOL or CORBA-compliant object request brokers (ORBs).

5.5.1 Elements of sequence diagramObject:Represents an object in the system or one of its components. Separator: Represents an interface or boundary between subsystems.

Call Message: A call (procedure) message between header elements

Message: A simple message between header elements

Return Message: A return message between header elements

Lifeline: Denotes the life of an object during a sequence.

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|A. Registration

For registration user request to m-banking system, system forwards the request to bank, and bank gives the acknowledgement to m-banking system and m-banking system gives the acknowledgement to user.

Figure 5.6: The Process of Registration.B. Check Balance

For check balance user has to request the, system forwards the request to bank, and bank gives the acknowledgement to m-banking system and m-banking system gives the acknowledgement to user.

Figure 5.7: The Process of Check balance.C. Account Statement

To view account statement user has to request the m-banking system, system forwards the request to bank, and bank gives the acknowledgement to m-banking system and m-banking system gives the acknowledgement to user.

Figure 5.8: The Process of Account Statement.D. Credit TransferFor credit transfer user has to request the m-banking system, system forwards the request to bank, and bank gives the acknowledgement to m-banking system and m-banking system gives the acknowledgement to user.

Figure 5.9: The Process of Credit Transfer.E. Intra Transaction

For Intra transaction user has to request the m-banking system, system forwards the request to bank, and bank gives the acknowledgement to m-banking system and m-banking system gives the acknowledgement to user.

Figure 5.10: The Process of Intra Bank Balance Transfer.F. Inter Transaction

In inter transaction user request system with necessary information, system request bank1 and bank1 acknowledge the Bangladesh bank and money from bank1 is transferred to bank2. Then acknowledgement is sent to user.

Figure 5.11: The Process of Inter Bank Balance Transfer.

G. Utility Bill payment

For utility bill payment user has to request the m-banking system, system forwards the request to bank, and bank gives the acknowledgement to m-banking system and m-banking system gives the acknowledgement to user.

Figure 5.12: The Process of Utility Bank Balance Transfer.H. Pin Alteration

For pin alteration user has to request the m-banking system, then m-banking system gives the acknowledgement to user.

Figure 5.13: The Process of PIN Alteration.I. Deactivate Account

For deactivate account user has to request the m-banking system, then m-banking system gives the acknowledgement to user.

Figure 5.14: The Process of Deactivate Account.7.2 Algorithm(A)RegistrationStep- 1: Enable WAP / GPRS service

Step-2: Select registration option from m-wallet menu

Step-3: Fill up the registration form with mobile number, bank name and account number then send

Step-4: If all the provided information is valid then registration is successful and secure PIN code is displayed otherwise registration failure noticed.(B)Checking out Balance Information

Step-1: Select balance checking option from m-wallet menu.

Step-2: Provide account number and PIN number.

Step-3: If account number and PIN number is valid then current account balance will be displayed; otherwise authentication failure noticed.(C)Intra Bank Balance Transfer

Step-1: Select intra baking balance transfer option from m-wallet menu.

Step-2: Provide payer and payees account number, amount and PIN number then send

Step-3: If all provided information is valid and amount is available then transfer the requested amount from payers account to payees account and send acknowledgement to account holder.(D) Intra Bank Balance Transfer

Step-1: Select inter baking balance transfer option from m-wallet menu.

Step-2: Provide payer and payees account number, amount and PIN number then send

Step-3: The system automatically sends collected information to corresponding prayer and payee bank.

Step-4: Payers account information, available balance are verified at the payer bank. If the payers information is authenticated then the payer bank sends request of balance transfer to central bank with necessary information.

Spep-5: Payees account information is verified at payee bank. If payees account number is a valid account of the payee bank then payee bank request the central bank to transfer the amount to the payee bank account.

Step-6: If central bank receives balance transfer request from both of the payer and payee bank then transaction is made and acknowledgement is sent to the account holder.(E) PIN Alteration

Step-1: Select PIN alteration option from m-wallet menu

Step-2: Fill up the PIN alteration form with mobile number, account number, old pin number and send.

Step-3: Sender account related information is verified.

Step-4: Then new PIN code is generated and acknowledged to the customer; otherwise authentication failure noticed.

(F) Credit Transfer

Step-1: Select credit transfer option from m-wallet menu

Step-2: Provide customers from account number and to account number, amount and PIN number.

Step-3: If both of the account numbers and PIN number are valid and have the transferable account balance then transfer credits from one account to another account; otherwise unsuccessful request acknowledged.(G) Account Statement

Step-1: Select account statement option from m-wallet menu

Step-2: Provide account number, PIN number and period of requested account statement

Step-3: If information is valid then account statement is provided with account number, bank name, transacted amount and date; otherwise authentication failure noticed.(H) Utility Bill Payment

Step-1: Select utility bill pay option from m-wallet menu.

Step-2: Provide payers account number and bill pay account number, amount, bill-type and PIN number then send

Step-3: The system automatically sends collected information to payer bank.

Step-4: Payers account information, available balance is verified at the payer bank. If the payers information is authenticated then the payer bank sends request of balance transfer to the mobile operators server with necessary information.

Step-5: If mobile operators server receives balance transfer request from the payer bank and bill pay account is valid then transaction is made and acknowledgement is sent to the payers mobile phone.(I) Deactivate Account

Step- 1: Enable WAP / GPRS service

Step-2: Select Deactivate account option from m-wallet menu

Step-3: Fill up the Deactivation form with mobile number, account number and pin number then send

Step-4: If all the provided information is valid then deactivation is successful otherwise deactivation failure noticed.

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