COCOMO II You are estimating the effort andschedule needed to implement a new traffic light control system.The estimated size of the system is 175 KSLOC.This is a life-critical system since failures can lead to seriousaccidents. This means it should be very high reliability. Astandard is being applied that requires less than 70% of executioncycles and memory space be used in normal operation.This is the third product in a traffic-light product line, withthis release being built for an international customer.The team is very highly knowledgeable and experienced in thisapplication domain and with these tools and can be considered veryhighly qualified and collaborative.Development will be done by tightly co-located team, all on thesame hallway of the same floor of their facility.The organization has been assessed as a CMMI maturity level 2organization.Use the COCOMO II Post-Architecture Model to estimate the effortand schedule for this project (tables listed as “Boehm, 2000” underReferences). PROVIDED BELOWThe default value for each factor is Nominal.Show your work; in particular, state (briefly) why you set eachnon-nominal factor to the value that you chose.Explicitly list the category (Very Low to Extra High) and value(e.g., 0.88 or 4.39) for each scale factor (all five) and eachnon-nominal effort multiplier.
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COCOMO II.2000 Post-Architecture Cost Driver Descriptions Nominal High Cost Drivers RELY DATA CPLX RUSE DOCU TIME STOR PVOL ACAP PCAP PCON APEX PLEX LTEX TOOL SITE: Collocation. ----- SITE: Communi- cation SCED Cost Drivers PREC FLEX+ RESLI TEAM Very LOW PMAT slight inconvenience many lifecycle needs uncovered 15th percentile 15th percentile 48% / year < 2 months < 2 months $ 2 months edit, code, debug international some phone, mail low, easily recoverable losses Very LOW (testing DB bytes Pgm ŠLOC) < 10 thoroughly unprecedented rigorous little (20%) very difficult interactions none SW-CMM Level 1 Lower some lifecycle needs uncovered major change every 12 mo.; minor change every 1 mo. 35th percentile 35th percentile 24% / year 6 months 6 months 6 months simple, frontend, backend CASE, little integration multi-city and multi-company individual phone, FAX 85% of nominal Moderate, easily recoverable losses 10 ≤ D/P < 100 largely unprecedented occasional relaxation some (40%) some difficult interactions. See Table 2.19 across project SW-CMM Level 1 Upper correct amount for lifecycle needs ≤ 50% use of available execution time ≤ 50% use of available storage major: 6 mo.; minor: 2 wk. 55th percentile 55th percentile 12% / year 1 year 1 year 1 year Basic lifecycle tools, moderately integrated multi-city or multi-company narrow-band email high financial loss 100 ≤ D/P < 1000 Somewhat unprecedented some relaxation Often (60%) basically cooperative interactions SW-CMM Level 2 across program excessive for lifecycle needs 70% use 70% use major: 2 mo.; minor: 1 wk. 75th percentile 75th percentile 6% / year 3 years 3 years 3 years strong, mature lifecycle tools, moderately integrated same city or metro area wide-band electronic communication 130% of nominal 75% of nominal 100% of nominal COCOMO II.2000 Post-Architecture Scale Factor Descriptions Nominal SW-CMM Level 3 Very High generally familiar general conformity generally (75%) largely cooperative ---- or the estimated Process Maturity Level risk to human life D/P> 1000 across product line very excessive for lifecycle needs 85% use 85% use major: 2 wk.; minor: 2 days 90th percentile 90th percentile 3% / year 6 years 6 years 6 years strong, mature, proactive lifecycle tools, well integrated with processes, methods, reuse same building or complex wide-band elect. comm, occasional video conf. 160% of nominal Very largely familiar some conformity mostly (90%) highly cooperative Extra High SW-CMM Level 4 across multiple product lines 95% use 95% use ******* fully collocated interactive multimedia Extra High thoroughly familiar general goals full (100%) seamless interactions SW-CMM Level 5 t degree of required adherence to stated system requirements, budgets, and schedules. ‡ percentage of module interfaces specified, subjectively averaged with the percentage of known significant risks mitigated.
Drivers Symbol PREC FLEX RESL TEAM PMAT RELY DATA CPLX RUSE DOCU TIME STOR PVOL ACAPT PCAPT PCON APEX PLEX LTEX TOOL SITE SCED COCOMO II.2000 Scale Factors and Efforts Multipliers XH RCPX RUSE PDIF PERS PREX FCIL SCED SF1 SF2 SF3 SF4 SF5 EM1 EM2 EM3 EM4 EM5 EM6 EM7 EM8 EM9 EM10 EM11 EM12 EM13 EM14 EM15 EM16 EM17 EM1 EM2 EM3 EM4 EM5 EM6 EM7 For Effort Calculations: 1For Scale Factors: 0.49 PRSF 2.12 1.59 1.43 = www. 6.20 5.07 7.07 5.48 7.80 0.82 0.73 Scale Factors 4.96 3.72 4.05 3.04 5.65 4.24 4.38 3.29 6.24 4.68 Post-Architecture Effort Multipliers 0.92 1.00 0.90 1.00 0.87 1.00 0.95 1.00 0.91 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 0.81 Multiplicative constant A = 2.94; Exponential constant B = 0.91 1.42 1.34 1.29 1.22 1.19 1.20 1.17 1.22 1.43 0.60 1.62 1.33 1.30 1.43 and 0.91 + (0.01 x SFMAX) 0.87 1.19 1.15 1.12 1.10 1.09 1.09 1.09 1.09 1.14 Early Design Effort Multipliers 0.83 0.95 1.00 1.26 1.12 1.10 1.14 PR Personnel/team capacity 1.00 1.00 1.00 1.00 1.00 1.00 1.00 = 2.48 2.03 2.83 2.19 3.12 1.10 1.14 1.17 1.07 1.11 1.11 1.05 1.15 0.85 0.88 0.90 0.88 0.91 0.91 0.90 0.93 1.00 ACAP ACAP 1.33 1.07 MAX MIN 1.00 0.83 0.87 0.87 1.00 1.24 1.01 1.41 1.10 1.56 1.26 1.28 1.34 1.15 1.23 1.29 1.17 1.30 0.71 0.76 0.81 0.81 0.85 0.84 0.78 0.86 1.00 For Schedule Calculations: 1.91 1.15 0.63 0.74 0.73 1.00 2For Effort Multipliers: MIN MAX 0.00 0.00 0.00 0.00 0.00 1.74 1.24 1.63 1.46 0.80 2.72 1.24 Multiplicative constant C = 3.67; Exponential constant D = 0.28 (100) (100) 0.91 +PR for Personnel/team capability shown on the front cover is determined as a combination of ACAP and PCAP: x PCAP x PCAP 0.50 0.62 0.62 Productivity Range1, 2 EMMAX PREM, EMMIN 1.33 1.26 1.39 1.29 1.43 1.54 1.42 2.38 1.31 1.52 1.63 1.46 1.49 2.00 1.76 1.51 1.51 1.40 1.43 1.50 1.53 1.43 5.55 1.31 1.00 4.24 2.56 2.31 1.43