CROSS-REFERENCE The effort estimates in this (Simple web server) table are
CROSS-REFERENCE The effort estimates in this table are derived from data in Table 8-10, “Nominal Schedules.” The schedule estimates are calculated using Equation 8-1 described in Section 8.5. 15.4 Productivity-Tool Use Table 15-1. Example of Savings Realized by Switching from a 3GL to a 4GL for 50 Percent of a 32,000 LOG Project Nominal Expected Final Effort Savings Effort (man-by (man- Activity months) Activity months) Explanation Architecture 6 0% 6 Same amount of (high-level architecture required. design) Any savings would be offset by the need to architect the combination of 3GL and 4GL languages. Detailed 8 38% 5 75% reduction for the design 50% of the program coded in a 4GL. Code/debug 8 38% 5 75% reduction for the 50% of the program coded in a 4GL. Unit test 6 0% 6 Same unit tests required for same functionality. Integration 6 30% 4 75% reduction for the part coded in 4GL, but extra integration required to mix 3GL and 4GL partially offsets the savings. System test 6 0% 6 Same system tests required for same functionality. Total Effort 40 20% 32 (man-months) Schedule Savings Expected 10.3 8% 9.5 schedule (calendar months) Here’s a somewhat more encouraging example. This time, suppose that you’re working on the same application as the last example, but that you can implement it completely in a 4GL. Table 15-2 on the next page illustrates the savings you can expect in this case.
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