Homework 1 Solutions
Contents
1. This can be simplified during design if this is difficult the requirement is to show some alternate weeks While it would be best to show resource unavailability at the start it s not possible to know whether there are enough resources until all the maintenance items have been specified which only occurs at this point The user may either accept or edit the week If the week is available the next page not shown takes payment information If the week is not available the same page is shown and the user makes another choice of week or cancels If the user submits the payment information page the next page not shown confirms the payment information and has a hyperlink back to the home page Order status query This Web page is not shown The user can hit the order status hyperlink on the home page and after the login sequence described in 1 above is presented with a page with all of her orders Ifa customer has a very large number of orders this would be awkward but this is not expected in AMS C Internal Users 1 The internal users select this hyperlink from the home page They go through the same login sequence as the external users except that their names addresses and other info are not in the aircraft database A separate table of internal users passwords and other administrative information is required Internal users are then presented a page to access all the database tables in the system In t2. Homework 1 Solutions 1 264 Fall 2002 This is a solution in outline form only and it does not cover all pages and details It only defines the core functions and screens This may make my resource estimates too low if yours are more detailed they are likely to be better That is part of what this homework shows I chose a very simple user manual format again it s only in outline form your homework should be more complete It also comments on the system in a way that a user manual would not I d do this differently if it wasn t a homework solution A text solution would describe the inputs and outputs in more detail instead of using charts A scenario solution would be similar but would be organized around the processes rather than the screens it would contain roughly the same material but in a different organization This solution is an example only you may have chosen quite different requirements That is fine as long as they solve the problem and have reasonable scope A Web site home page 1 The aircraft maintenance system AMS is a Web based application that allows customers to place orders for work on aircraft a AMS will schedule and price the work and provide status information b AMS allows your employees to manage your aircraft engine order and customer data 2 Home page Hyperlinks are underlined a Users can go to i marketing info which will be contact us about us feedback news il services a l
3. e page above 6 The modify hyperlink leads to a new page not shown in which the primary key is entered in the text box After it s entered and the row is retrieved a form like the add form is shown except with all the text boxes filled in with the current values The user may type over them except for the primary key There are submit and cancel buttons at the bottom of the page Error pages are shown if the primary key is not found or if there is an invalid modification 7 The data in the aircraft aircraft type engine type tables is as defined in the homework 1 statement the data will be modeled and modified in homework 2 The order data contains the fields from the order pages shown above there will be order header and order detail tables 8 Aircraft data that is changed through maintenance procedures for example changing the engine type must be manually edited by an internal user 9 Order status changes are manually entered by internal users The status codes are initial in progress completed and aircraft departed 10 If a part cannot be obtained in time to do maintenance the next week the internal user must find the record call the customer and manually change the work date or cancel the order D Size Estimation 1 To estimate the size of the system we count function points Web inputs Low complexity Login external login internal internal user db access h
4. e months 7 Conclusion Even at this level of detail you should be concerned with the resources and schedule We will reduce the work in this class from that defined in this solution and you should have done the same in your requirements We will not implement a number of the requirements in the and we will not have as many database related functions as a true commercial system would have
5. h a system 36 this size the person months will be less than 36 of 9 months An estimate of 30 is reasonable or about 2 7 person months 4 Estimate schedule months Using table 8 10 the 6 schedule months for 10 000 lines will be reduced for a project of 3 600 lines but not proportionally Using an exponent of 0 4 table 8 7 a project that is 36 of the effort should take about 36 time or about 0 66 the time The 6 schedule months thus becomes about 4 months 5 Team size This is not required in the homework but it s good to look at it With 2 7 person months over 4 schedule months the average team size is about 6 persons or 24 hours week With a three person team this would be consistent with the class effort Unfortunately the homeworks are scheduled over about a 2 5 month period so this will be difficult With this set of requirements you could eliminate some features right now you could implement improved process efficient schedules etc For now don t change anything but we will reduce what your systems do in the following homeworks as mentioned in class to match the resources better 6 Ranges At this point we have an initial project definition Our estimate of effort is between 0 25 and 4 0 times the point estimate so it s between 0 7 and 10 8 person months Our estimate of schedule is between 0 6 and 1 6 times the 4 schedule months of our point estimate so the range is between 2 4 and 6 4 schedul
6. he simple version built in our homeworks only 4 tables are presented aircraft engines aircraft types and orders Access to all tables is presented this way even if others are later added Aircraft Aircraft types View all aircraft View all aircraft types Add aircraft Add aircraft types Delete aircraft Delete aircraft types Modify aircraft Modify aircraft types Engines Orders View all engines View all orders Add engines Add orders Delete engines Delete orders Modify engines Modify orders 3 The view all hyperlink in the page above leads directly to a results page in which all aircraft are listed 4 The add hyperlink leads to a new page not shown in which there are text boxes for all the data fields for an aircraft and submit and cancel buttons at the bottom of the page The page checks that the N number is unique primary key and that other data is valid to be defined in the data model If the input is valid the row is added to the database If not an error page is displayed with a hyperlink to return to the page above 5 The delete hyperlink leads to a new page not shown in which the primary key is entered in the text box aircraft N number aircraft type engine type order number There are delete and cancel buttons at the bottom of the page If the key is present the row is deleted from the database If not an error page is displayed with a hyperlink to return to th
7. ist of services maintenance avionics interior painting testing and iii prices for each service b External users can place orders and check status c Internal users will go to a login page Home About us Contact us Feedback a Welcome to MIT Maintenance Aero Services Avionics Interior Paint Testing Text pictures for home page Prices Orders Order status Internal users 3 The marketing info will be several hyperlinks About us is a text page with company info Contact lists phone numbers addresses and a map Feedback has an email form that can be sent to the company News contains information the company adds occasionally There is no site search page there are security problems with the Microsoft implementation available to us so we don t use it 4 The services list is maintenance aircraft and engine avionics electronics interior paint and testing Each of these is a hyperlink that describes the service in more detail 5 The price list is a table with prices This is much simpler than it would be in real life 6 The orders and status hyperlink takes the external user to a series of pages described below 7 The internal users hyperlink goes to a login page The login page contains the username and password a If login is successful the user is taken to the internal user home page b If login is not successful the user is returned to the login page wi
8. k and edit a previous page by pushing the previous button This allows for an arbitrary number of maintenance activities per order Order number system generated Customer name from previous page Aircraft number from previous page Enter service type pulldown maint interior paint avionics test Enter quantity usually 1 but can be multiple engines tests Enter comments free format in text box Next Previous Complete 4 When the user hits complete AMS takes her to a summary page shown below The Complete page shows header information on the top as well as computing the prices for each service and the order total Order number Customer name Aircraft number Maintenance service Qty Price Extended price As many rows as needed generated on Web page Order subtotal Tax Order total Week service requested Week service can be scheduled or or System generates up to 3 alternate weeks if requested week not available 5 The system checks whether there are sufficient maintenance resources to meet the order in the requested week If there are the week service can be scheduled is the same as the week service requested in the Web page above The week service requested has to be greater than the current week in any case If there aren t sufficient resources in the requested week the system suggests the 3 closest weeks with resources
9. ome 4 view table 4 delete table Medium complexity Order header High complexity Order detail summary payment 4 add table 4 modify table Web outputs Low complexity home page about contact feedback news 5 services price order confirmation Web inquiries High complexity Check order status We estimate 20 tables for now we will know that better in homework 2 We have no external interfaces messages etc We assume they are medium complexity for now Thus our function points are Program unit Low Medium High Web inputs 11x3 33 1x4 4 11x 6 66 Web outputs 12x4 48 0 0 Web queries 0 0 1x6 6 Database tables 0 20 x 10 200 0 Total 357 2 Estimate lines of code Program unit Tool Lines function point Web inputs outputs queries FrontPage 10 code generation Windows inputs outputs queries Visual Basic 10 code generation Database Access SQL 10 code generation The total lines of code is approximately 3600 The assumptions are too optimistic for a commercial product but are reasonable for a class project using tools and not handling errors special cases etc If you used the numbers in the McConnell table you d get about four times as many lines Either answer is ok 3 Estimate person months Using table 8 10 Nominal Schedules for Business Products the lowest entry is 10 000 lines of code with 6 schedule months and 9 person months Wit
10. th an error message This is simpler than in real life i ae co B Placing orders 1 The external user is shown a login page which has text boxes for username and password If the user doesn t have a username and password there are text boxes to enter customer name and address and password The customer name and address are checked against the aircraft table in the database and if there is a match an account is created The password is stored in the database securely There are no provisions for forgotten passwords the user must call the maintenance company and an internal user can blank the password and then the user can reset it The external user is taken to a page with an order header She fills out all the overall information about the order See parts D and F 4 of homework 1 for more information on these fields Customer name Company name Address City State Zip Office Telephone Hangar Telephone Email Aircraft number Aircraft model Aircraft serial number Date week service requested Next There is a next button on the page that takes the external user to the set of services to be ordered The next page displays with the order number at the top assigned by AMS and obtains order detail It displays the customer name and aircraft number for convenience to minimize confusion The system displays a blank next page when the next button is pushed The user can go bac
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