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Planning III Estimating SW Size, Giovani FLores - Coggle Diagram
Planning III Estimating SW Size
Estimate the size of sw product to help you to plan the product´s development. Method PROBE
Poor sw planning - main reason of troubles.
Start with a design specification - Then examine and estimate each part of the job
Compare them with your historial experience.
Size estimating Criteria
Structured and trainable methods
It can be used in all sw phases
Usable for all sw products
be suitable for statistical analysis
Popular Stimating methods
Wideband Delphi
Several engineers individually produces an estimation and then using the method, converge on a consensus estimate
Fuzzy - logic
Estimators asses planned product and judge how it compares with HISTORICAL DATA on prior products
Historical data required
Standart-Component
Use HISTORICAL DATA to make progressively more-refined program size estimation
Estimated number = [ smallest conceivable n° + 4*( likely n° ) + largest conceivable n° ] /6
Funcition - point
Most popular method
Identified five basic functions that frecuently occur in Comersial sw development and categorized them according to their relative development complexities
Inputs
forms
Outputs
screens or reports
Inquieries
help screens
Data Files
one table within a relational DB
Interface
PROXIES
A substitute for LOCS
Objects
Screens
Files, etc
PROBE
Proxy - Based Estimating
Objects as proxies
Process
Then, identify objects
NExt, calculate projected and modified LOC
Then estimate program size
Calculate prediction interval
Conceptual DEsign
Identify object and categorized
Object Size categories
Size ranges are helpful if narrow
Small
medium
Very small
Large
Very large
Problems
Bias
Few Statistical DAta
Large Systems
Unprecendent products
no experience
Over and under compesation
Giovani FLores