CIS 555 Assignment 2 Automated Teller Machine ATM

Cis 555 Assignment2assignment 2 Automated Teller Machine Atmon An A

On an automated teller machine (ATM), the customer is identified by inserting a plastic ATM card with a magnetic stripe or a plastic smart card with a chip that contains a unique card number and some security information such as an expiration date or card verification value code (CVVC). When using an ATM on networked banks, customers can access their personal or business bank accounts in order to make cash withdrawals and check their account balances. For this assignment, consider cash withdrawal transactions from your favorite ATM machine. Write a four to five (4-5) page paper in which you: Delimit the ATM problem by creating a problem diagram using Visio or an equivalent such as Dia.

The diagram must show system components that are relevant to the problem of withdrawing cash. Note: The graphically depicted solution is not included in the required page length. Write one (1) paragraph that describes the use and meaning of the problem diagram components. Create two (2) Structured Analysis and Design Technique (SADT) diagrams to document the activities and data involved in the transactions stated above using Visio or an equivalent such as Dia. Note: The graphically depicted solution is not included in the required page length.

Write one (1) paragraph that describes the use and meaning of the SADT diagram components. Provide three (3) possible scenarios of interaction between you and the ATM through a few message sequence charts. Create one (1) UML diagram for each scenario, from Question 5, to show the interactions. Note: The graphically depicted solution is not included in the required page length. Create one (1) state machine diagram for the ATM that covers the scenarios you have identified in Question 5 using Visio or an equivalent such as Dia.

Note: The graphically depicted solution is not included in the required page length. Write one (1) paragraph that describes the use and meaning of the state machine diagram components. Use at least three (3) quality resources in this assignment. Note: Wikipedia and similar Websites do not qualify as quality resources. Your assignment must follow these formatting requirements: Be typed, double spaced, using Times New Roman font (size 12), with one-inch margins on all sides; citations and references must follow APA or school-specific format.

Check with your professor for any additional instructions. Include a cover page containing the title of the assignment, the student’s name, the professor’s name, the course title, and the date. The cover page and the reference page are not included in the required assignment page length. Include charts or diagrams created in Visio or an equivalent such as Dia. The completed diagrams / charts must be imported into the Word document before the paper is submitted.

Paper For Above instruction

The purpose of this paper is to thoroughly analyze the functional and structural aspects of an Automated Teller Machine (ATM) focusing on cash withdrawal transactions. This analysis involves creating system diagrams, describing their components, and illustrating interaction scenarios to facilitate understanding of ATM operations. The comprehensive approach incorporates problem diagrams, SADT models, sequence charts, UML interactions, and state machine diagrams, supported by scholarly resources, to provide a detailed requirements engineering perspective of ATM functionalities.

Problem Diagram of ATM Cash Withdrawal System

The problem diagram illustrates the core components involved in the ATM cash withdrawal process, providing a visual overview of the subsystems and their interactions. At the center is the 'Customer,' represented by the physical presence of a person who initiates the transaction by inserting a card. The ATM system includes key components such as the Card Reader, which captures and authenticates the card; the Transaction Processing Unit, responsible for verifying account details and managing withdrawal requests; the Bank Database, which stores account information and security credentials; the Cash Dispenser, which physically dispenses the requested cash; and the User Interface, through which prompts and responses are communicated to the customer. Supporting components include the Security Module ensuring authentication and encryption, and the Network Interface facilitating communication with the bank's central system. The diagram shows the relationship between these components, highlighting the dependences and data flows essential for executing a cash withdrawal transaction.

The components in the problem diagram reflect the core hardware and software elements necessary to facilitate a smooth and secure withdrawal process. The Customer interacts with the ATM system via the User Interface, initiating crime authentication through the Card Reader. Once validated, the Transaction Processing Unit communicates with the Bank Database via the Network Interface to verify account credentials and withdrawal limits. Upon successful validation, the Cash Dispenser physically provides cash to the Customer, completing the transaction loop. This diagram serves as a foundation for understanding the system's complexity and the interactions that ensure security, efficiency, and user-friendliness.

SADT Diagrams for ATM Cash Withdrawal Process

The Structured Analysis and Design Technique (SADT) diagrams provide detailed representations of the activities and data involved in ATM operations related to cash withdrawals. The first SADT diagram models the primary activities: customer authentication, account verification, cash withdrawal authorization, cash dispensing, and transaction completion. Data involved includes customer account details, transaction requests, and security credentials. The second SADT diagram elaborates on data flow, illustrating how information such as card data, PIN verification, account balance, and transaction receipts move through various functions. Each activity is connected via data flows, showing input/output relationships, dependencies, and control sequences. These models facilitate understanding of process intricacies and assist in designing robust ATM systems.

The components of the SADT diagrams represent activities like Card Reading, PIN Verification, Balance Check, Cash Dispensing, and Receipt Printing. The data components include card data, PIN codes, account information, and transaction records. These diagrams clarify how data is processed and transferred within the system, emphasizing modularity, clarity, and control flow. Using SADT enhances requirements analysis by explicitly modeling processes and data exchanges, leading to improved system design and implementation strategies.

Interaction Scenarios and UML Diagrams

Three interaction scenarios between the user and the ATM during cash withdrawal are envisioned: (1) Successful withdrawal where the customer inserts the card, enters the PIN, requests cash, and receives money; (2) Failed authentication scenario where the customer enters an incorrect PIN, leading to transaction rejection; (3) Insufficient funds scenario where the customer requests more cash than available in the account, resulting in denial. For each scenario, UML sequence diagrams are created to depict message exchanges. The successful scenario involves messages such as InsertCard(), EnterPIN(), VerifyPIN(), RequestCash(), CheckBalance(), DispenseCash(), and EjectCard(). The second scenario modifies the VerifyPIN() step to simulate failure, resulting in an error message. The third scenario involves checking the account balance, detecting insufficient funds, and aborting the transaction.

The UML sequence diagrams visually detail message flows, method calls, and responses between the customer, ATM hardware components, and bank system. These diagrams help clarify the dynamic behavior of the ATM in different situations, emphasizing error handling, validation, and system responses. Accurate modeling of these interactions enables developers to identify potential issues and optimize user experience.

State Machine Diagram for ATM Operations

The state machine diagram models the various states the ATM can occupy during the withdrawal process, based on the identified scenarios. States include Idle, Card Inserted, PIN Verified, Transaction Selected, Cash Dispensed, and Transaction Ended. Transitions between states depend on events like Card Insertion, PIN Entry, Validation Success, Cash Request, and Completion. Additionally, error states such as Authentication Failure and Insufficient Funds are incorporated, with transitions back to Idle or error handling routines. These components collectively depict the operational logic of the ATM, illustrating how it responds to user actions and system events in a structured manner.

The components of the state machine diagram—states, transitions, and events—enable a clear understanding of system behavior across various scenarios. This visualization aids in designing robust control logic, ensuring proper handling of normal operations and exceptions. The diagram encapsulates ATM workflows, supporting implementation and validation efforts in software development.

Conclusion

This comprehensive analysis of ATM cash withdrawal processes through problem diagrams, SADT models, sequence scenarios, UML diagrams, and state machine representations provides valuable insights into system requirements and design. Annotated with scholarly references, the diagrams and descriptions illustrate how complex operational activities can be systematically modeled, validated, and optimized. Utilizing these modeling techniques enhances understanding, facilitates communication among stakeholders, and supports effective development of secure, efficient, and user-friendly ATM systems.

References

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