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    Chapter 14

    Page 94 Revised March 2002

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    Case Studies and Exercises

    Enhanced Weather ApplicationRelease 2.0

    Release 2.0 is an enhancement to The Weather Application Release 1.0. The user wants theability to save temperature as either Celsius or Fahrenheit. To accomplish this a radio button isadded to the input screen, which allows the user to select either Celsius or Fahrenheit. Anadditional field is added to the file, and an additional field is added to the reports. Assume thatthe value adjustment factor increases to 1.0.

    How many enhancement function points does this represent?

    What is the baseline function point of release 2.0?

    Copyright Longstreet Consulting Inc.Page 95

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    Case Studies and Exercises

    BikeWareRelease 1.0

    BikeWare is a software product designed for competitive bike riders. BikeWare captures andstores a variety of information. BikeWare is for a single rider only. The rider wants to be able tochange, add or delete information about a ride or rider. The following information is either entered by the rider or calculated. All bold items are stored. The following information isgrouped logically into two major groups (ride and rider):

    Ride InformationAverage Speed Bike Chill Factor

    T = Temperature during the RideW = Average Speed

    X = .303439 * sqr (W) - .0202886 * WBikechill = Int (91.9 - (91.4 - T) * (X + .474266))CadenceCalories Burned = Exponential ((.092037 * Average Speed) - 4.26)) * (Duration of Ride) *Weight of Rider)

    Date of the RideDistance of the RideDuration of RideTemperature during the Ride

    Rider InformationAge (age of rider in years)Weight (weight of rider)Sex (sex either male or female)

    Graphs Four separate graphs (see below) can be created by days, by weeks or by months for each item

    below. A different set of calculations will be used depending of the graph is days, weeks or amonths graph. Each graph is available on line or as a hard copy and processing logic is different.

    Distance of RideAverage SpeedDuration of RideCalories Burned

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    Case Studies and Exercises

    For BikeWare determine the following information:

    Identify the external inputs, how many data elements and how many files will be referenced?

    How many files type referenced are there for the add, the change and the delete? Is it always thesame?

    How many internal logical files are there and what are the data elements?

    How many external outputs? Describe the external outputs also?

    How many data elements for each external output?

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    Chapter 14

    Pizza Screen Design

    Option 1Toppings are read from

    another application(kitchen application). If the topping is notavailable it is notdisplayed.

    The cost of the Pizza iscalculated automatically.

    When the OK button is clicked the Toppings, Pizza Crust Type and Cost of Pizza are saved.

    Option 2The Items in the drop down box are hard code not read from a file.Available Toppings are read from another application (kitchen application).When a Topping is selected from Available Toppings it is copied to Selected Toppings

    Page 98 Revised March 2002

    Figure 8

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    Case Studies and Exercises

    The Cost of the Pizza is

    automatically calculated.When the OK button is clicked the Selected Toppings, Pizza Crust Type and Cost of Pizza are thesaved.

    What are the differences if any between Option 1 and Option 2? Please fill in the table below.

    Option 1 Option 2Component Data Elements Component Data Elements

    Note: Components are external input, external inquiries, internal logical files, and externalinterface files

    Figure 9

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    Chapter 14

    www.PIZZACLUB.COM

    Part 1

    WWW.PizzaClub allows customers to order pizza via the Internet. The following is only onescreen of many screens.

    1. Once the customer has accessed www.PizzaClub.Com they fill out this screen.2. When the customer clicks on the form the information is saved to a file.3. If any of the fields are not filled out (populated) the customer receives and error message

    telling them All fields must be populated.

    4. What are the data elements?5. How many unadjusted function points does this screen and one file represent.

    Page 100 Revised March 2002

    Figure 10

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    Case Studies and Exercises

    Part 2

    Www.PizzaClub.com is going to be enhanced. Instead of allowing the customer to type city andstate, they will input the zip code number. The application will search the zip code file and then

    automatically populate City and State. The customer can override the populated fields. The zipcode file is maintained by another application.

    How many unadjusted function points does this enhancement represent?

    What are the new components?

    What data elements are impacted?

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    Chapter 14

    Control Information

    What are the data elements in the following control screen (alignment)?

    Figure 11

    -Control Screen

    How many data elements are therein the following Data EntryPreferences control screen?

    Page 102 Revised March 2002

    Figure 12

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    Case Studies and Exercises

    If this control screen updates one internal logical file, then how many unadjusted function pointsdoes this represent?

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    Chapter 14

    Word Problem 1

    Lets assume your productivity rate is 10 hours per function point (it takes 10 hours of work todeliver a function point). Additionally, assume your cost per hour is $60. Therefore, the cost todeliver 1 function point is $600.

    1. How much would it cost to develop an application with 5,000 function points?

    2. Lets assume you anticipate a Maintenance Rate is $100/Function Point. How much needs to be budgeted to cover Maintenance Expenses for the first year?

    3. Assume that the application will be operational for 6 years (application life expectancy is 6years). Maintenance Costs will be fixed at $100/Function Point Per Year. What is the totalexpected cost of the application-- including all development and maintenance costs?

    4. Should maintenance costs be considered when developing an application? How do youdetermine expected maintenance costs?

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    Case Studies and Exercises

    Word Problem 2

    Assume the same cost per function point as before ($600).

    Suppose a vendor, a tool vendor, and claims that his tool will increase productivity by 50 percent-- cut your cost per function point in half. Assume the following to be true:

    You are planning on implementing 1,000 function points over the next year.You want the tool to pay for itself within 1 year.

    1. What is the maximum amount you would be willing to pay for this tool -- You want to break even.

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    Chapter 14

    ACRONYMSDET Data Element Type (DET) : A DET is a unique user recognizable, non-

    recursive (non-repetitive) field.EI External Inputs (EI) - is an elementary process in which data crosses the boundary from outside to inside.

    EIF External Interface Files (EIF) - a user identifiable group of logically relateddata that is used for reference purposes only.

    EO External Outputs (EO) - an elementary process in which derived data passes across the boundary from inside to outside

    EQ External Inquiry (EQ) - an elementary process with both input and outputcomponents that result in data retrieval from one or more internal logicalfiles and external interface files.

    FTR File Type Referenced (FTR) : A FTR is a file type referenced by atransaction. An FTR must also be an internal logical file or externalinterface file.

    GSC General System CharacteristicsILF Internal Logical Files (ILF) - a user identifiable group of logically related

    data that resides entirely within the application boundary and is maintainedthrough External Input

    RET Record Element Type (RET) : A RET is user recognizable sub group of dataelements within an ILF or an EIF

    UAF Unadjusted Function PointsVAF The value adjustment factor (VAF) is based on 14 general system

    characteristicsAFP Application Function Point Count after the enhancementAFPB The initial application function point count or baselineCFP Conversion Unadjusted Function Point CountDFP Development Project Function Point CountEFP Enhancement Project Function Point CountUFP Unadjusted Function PointsUFPB Unadjusted Function Point Count Before EnhancementVAFA The value adjustment factor of the application after the enhancement

    project.VAFB The value adjustment factor of the application before the enhancement

    project.

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    1 Albrecht, A.J.: Measuring Applications Development Productivity. Proceedings of IBM Application Development JointShare Guide Symposium, Monterey, CA, 1979, pp. 83-92.2 Symons, C. R., 1998, Function Point Analysis: Difficulties and Improvements, IEEE Transactions of SoftwareEngineering, Vol. 14 No.1, January, pp 2-11.3 Garrison, Ray and Eric Noreen. Managerial Accounting. Irwin McGraw-Hill, 2000.4 Ferguson, C.E and Charles Maurice. Economic Analysis and Application. Homeword Illinois: Richard D. Irwin, Inc,1978.