Session – 2
This session is to estimate the size, effort, schedule, and cost of the railwayreservation project.The four basic steps in Railway Reservation project estimation are:1.Estimate the size of the development product. This generally ends up ineither Lines of Code (LOC) or Function Points (FP), but there are other possible units of measure. A discussion of the pros & cons of each isdiscussed in some of the material referenced at the end of this report.2.Estimate the effort in person-months or person-hours.3.Estimate the schedule in calendar months.4.Estimate the project cost in dollars (or local currency)The railway reservation project requires 75KBLOC. On the basis of this size of the project we have to estimate the remaining estimations. We have the formula toestimate the schedule of the project.Schedule in months = 3.0 * (effort-months)
Opinions vary as to whether 2.0 or 2.5 or even 4.0 should be used in place of the 3.0 value - only by trying it out will you see what works for you.Of course, you must also keep in mind other important factors that affect theaccuracy of your estimates, such as:•The accuracy of all the estimate's input data (the old adage, "Garbage in,Garbage out", holds true)•The accuracy of any estimate calculations (e.g., converting betweenFunction Points and LOC has a certain margin of error)•How closely the historical data or industry data used to calibrate the modelmatches the project you are estimating•The predictability of your organization's software development process, andwhether or not the actual project was carefully planned; monitored andcontrolled, and no major surprises occurred that caused unexpected delays.
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