Question 1 Assume that 5 errors have been introduced in the requirements model and that each error will be amplified by a factor of 1:1.5 into design and an addition 12 design errors are introduced and then amplified 1.3 into code where an additional 30 errors are introduced. Assume further that all unit testing will find 45 percent of all errors, integration will find 50 percent of the remaining errors, and validation tests will find 50 percent of the remaining errors. No reviews are conducted. How many errors will be released to the field?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Question 1
Assume that 5 errors have been introduced in the requirements model and that
each error will be amplified by a factor of 1:1.5 into design and an addition 12
design errors are introduced and then amplified 1.3 into code where an
additional 30 errors are introduced. Assume further that all unit testing will find
45 percent of all errors, integration will find 50 percent of the remaining errors,
and validation tests will find 50 percent of the remaining errors. No reviews are
conducted. How many errors will be released to the field?
Question 2
Reconsider the situation described in Problem Question 1, but now assume that
requirements, design, and code reviews are conducted and are 60 percent
effective in uncovering all errors at that step. How many errors will be released
to the field?
Question 3
Reconsider the situation described in Problems Question 1 and Question 2. If
each of the errors released to the field costs $4,800 to find and correct and each
error found in review costs $240 to find and correct, how much money is saved
by conducting reviews?
Transcribed Image Text:Question 1 Assume that 5 errors have been introduced in the requirements model and that each error will be amplified by a factor of 1:1.5 into design and an addition 12 design errors are introduced and then amplified 1.3 into code where an additional 30 errors are introduced. Assume further that all unit testing will find 45 percent of all errors, integration will find 50 percent of the remaining errors, and validation tests will find 50 percent of the remaining errors. No reviews are conducted. How many errors will be released to the field? Question 2 Reconsider the situation described in Problem Question 1, but now assume that requirements, design, and code reviews are conducted and are 60 percent effective in uncovering all errors at that step. How many errors will be released to the field? Question 3 Reconsider the situation described in Problems Question 1 and Question 2. If each of the errors released to the field costs $4,800 to find and correct and each error found in review costs $240 to find and correct, how much money is saved by conducting reviews?
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