Tutorial: COCOMO, Ada COCOMO and COCOMO

80 Pages·2009·1.76 MB·English

Tutorial:
COCOMO, Ada COCOMO
and COCOMO 2.0
Barry Boehm, USC
COCOMOISCM Forum 9
October 5,1994
Outline
COCOMO Summary
Ada COCOMO Summary
COCOMO 2.0 Status
Summary
COCOMO Baseline Overview I
s
0'
Software product size estimate
Software development, mainten-
c co
0 0
M ance cost and schedule estimates
Software product, process, corn-
- -
II I
Software reuse, maintenance, Cost, schedule distribution by
4
and increment parameters phase, activity, increment
Software organization's
project data
COCOMO recalibrated to
L organization's data
COCOMO Baseline Overview II
Open interfaces and internals
-
Published in Software Enqineerinq
Economics, Boehm, 1981
Numerous implementations, calibrations,
extensions
-
Incremental development, Ada, new
environment technology
- Arguably the most frequently-used software
cost model worldwide.
1 I 1
COCOMO FEATURES
EVELOQMENT COST AN0 SC).(O€ UUE ESTIMATES
3 LEVELS OF FIDELITY
MACRO AND MICRO ESTIMATION
SENSITIVITY ANALYSIS
SOFTWARE ADAFTATION, CONVERSION COSTS
SOFWARE MAINTENANCE COSTS
CALI6RAWN TO US- ENVIRONMENT
INTERMEDIATE COCOMO MODEL
1. DETERMINE NOMINAL EFFORT AS FUNCTION OF SIZE
ORGANIC MODE: MMNoM = 3.2 (KDSI)~~
SEMI-DET MODE: MMNoM = 3.0 (KDS1)1-12
EMBEDDED MODE: MMNoM = 2.8 (KDSI)~.~~
2. DETERMINE EFFORT MULTIPLERS (EM)i AS FUNCTION OF
15 OTHER SOFTWARE COST DRIVER ATTRIBUTES
3. ESTIMATE DEVELOPMENT EFFORT AS:
4. ESTIMATE DEVELOPMENT SCHEDULE FROM MM
i
i
i
.- .-- .- .. .
DtSTmGUMMG FEATURES OF $ORWARE
DEVELWMLNT Moo€S
ORGANIC EMBEDDED
ORGANIZATIONAL UNDERSTANDIM
OF PRODUCT OBJECTIVES THOROUGH CONSIOERABLE GENERAL
EXP€RWCE IN WORKING WITH
...
-TIED SOFTWARE SYSTEMS EXTENSIVE CONSIOERABLE MODERATE
0 .
PRODUCT SUE RANGE < 50 KDSl ~30K0D Sl AU SUES
EXAMCCES BATCH DATA MOST TRANSACTKM
REDUCTION PROCESSING SYSTEMS
SCIENTIFIC MOST OS, DBMS
MOOELS
AMBITIOUS INVEWTWW,
PRODUCTION COMTROC
NGUAQE EXP6RENCL
1.23 SCWULE CONSTRAINT
4 -
1.a3 DATA BASE SIZE
T B TIY
VmTW U(PR€ IENCL
-
1. 40 VmTW YkCmm rOUTlLlTY
1
1.40 WTIIIYICIL TOOLS
m C M PRACTICES
S M COWE TRAMT
A m m m m r E X)(ER(IE)(CE
1. W T mCO mTRAMT
1. ST MOVlMO #LIA.ILITY
2.38 PMK)(JCT COMPLEXITY

-
EXAMPLE MEGABIT COMMUNICATIONS CO.
Ib@JO DSi COMMUNICATIONS PROCESSING SOFTWARE
EMBEODfD WOE
-
LOCAL USE MODERATE EFFECT OF FAILURES
20,000 BYTE DATA BASE
MICROPROCESSOR COMM-LINE HANDLING
9 USES 7U% OF AVAILABLE CPU CAPACITY
USES 45K OF 64K STORE I