Sequence Diagram Flight Reservation System Assignment

Sequence Diagram Flight Reservation System - Assignment Example The sequence diagram is a critical part utilized in procedures of analysis and design documentation of user requirements. The sequence diagram is a tool of Unified Modelling Language (UML) that represents the interaction of different actors with the system in order to get a result/response (Bell, 2004). The Sequence diagram is one of the most usable and useful diagrams to represent the interaction of one or more objects’ interactions with one or more systems. It is pertinent to mention here that we have to develop / draw a Sequence diagram for each and every Use Case. The Sequence diagrams are used to model the usage scenario of the system, the logic of the methods and logic of the service. The sequence diagrams are used to describe the complicated operations, methods or functions in graphical or pictorial mode. Moreover, it also represents the services provided by the system to their clients, for example, the web services i-e online flight reservation system. The Use Case dia gram enables modelling of a business view of the scenario, the Sequence diagram contains implementation details of the scenario, including the objects and classes that are used to implement the scenario, and messages passed between the objects (Ambler, 2012). As per the sequence diagram (given below) of the online Flight Reservation System and the definition of the sequence diagram, the actors that were identified in Use Case Diagram (customer, website) has been utilized in the Sequence Diagram. The first actor is the 'Customer' that would interact with the 'Website' (system). As shown in the following figure, the customer does all the interaction with the system from searching flight till the provision of the PIN code. Initially, the customer opens the website of the service provider (airline or agent of the flight reservation) and clicks the search flight tab of the website. The website would open the flight search form and the customer has to enter the required information includ es: the departure and arrival airport, one way or round trip, the date of departure and return (if round trip) and the number seats / tickets. The customer submits the form and after processing, the website shows the search results. At this point the customer can go back to the search page and re-enter all the information, otherwise, the customer can select and book the flight. The website provides the review page along with payment information. The customer has to fill the form with required information include: full name, passport number and payment method (credit card information). The website provides the confirmation page and the customer confirms the booking. The system processes the customer’s request and presents a personal identification code (PIN) for the future reference (Popkin Software, 1998). Sequence Diagram Reference List Janssen, C., 2010. Sequence Diagram. [online] Available at: [Accessed 02 December 2012] Ambler, S. W., 2012. UML 2 Sequence Diagrams. [onlin e] Available at: [Accessed 02 December 2012] Bell, D., 2004. UML basics: The sequence diagram. [online] Available at: [Accessed 02 December 2012] Popkin Software., 1998. Modelling System with UML. [online] Available at: [Accessed 02 Dec

About Capital Asset Pricing Model Essay Example | Topics and Well Written Essays - 2000 words

About Capital Asset Pricing Model - Essay Example CAPM holds that investors are operating in a perfectly capital market and all securities are valued accurately. If we plot the returns on the Security Market Line than none of the returns will be above or below the SML Line. A perfect capital market assumes that information is freely available to all the investors who have homogenous expectations. Secondly, the model assumes that the assets are infinitely divisible. This assumption emphasizes that investors can take any position in investment. For instance, they can buy $1 worth of stock of Intel Corporation. The third assumption about CAPM is that personal taxes are not present which implies that returns generated in the form of dividends or capital gains are not taxed. The fourth assumption is that individual investors do not have power to affect the prices of stocks by the action of their buying and selling rather it is determined in total by their actions. The fifth assumption is that investors make decision based on expected returns or risk, the other factors such as behavioral finance is not accounted to it. The sixth assumption is that there is no restriction on amount of short sales; individuals are free to conduct as many short sales transaction as possible. The seventh and the most stringent assumption is that investors are given the choice to borrow or lend unlimit ed amount of money at the risk free rate. The eighth assumption deals with the homogeneity of the investors’ expectations which mean that all the investors have defined their relative period of investment in exactly the same manner. The final assumption withholds that all the assets are marketable whether they be financial or non-financial such as human capital. CAPM has its roots build on the model of portfolio developed by Markowitz in late 50’s. According to the Markowitz’s model of â€Å"Mean-Variance analysis†, the investors are risk averse and will prefer more return on the same level of