COSMIC Approximation

The team

Frank Vogelezang

Charles Symons

Arlan Lesterhuis

Roberto Meli

Maya Daneva

Introducing the Guideline for approximate COSMIC Functional Size

Measurement

Purpose of the Guideline

Describe the current State of the Art

Applicability and reported use

Strengths and Weaknesses

Recommended area of application

Introducing the Guideline for approximate COSMIC Functional Size Measurement

General principles

Introducing the Guideline for approximate COSMIC Functional Size Measurement

Average functional process

Sampling

Measure a comparable piece of FUR

Determine the average size of an FP

Use the sample data on FUR to be measured

#FP * Average FP Size

Introducing the Guideline for approximate COSMIC Functional Size Measurement

Fixed size classification

Identify typical size classifications

Assign a functional size to it

Introducing the Guideline for approximate COSMIC Functional Size Measurement

Equal size bands

Sampling Measure a large number of representative FP

Divide the total functional size in equal bands

Determine the average FP size per band

Sample from avionics software

Introducing the Guideline for approximate COSMIC Functional Size Measurement

Average Use Case

Sampling Measure a number of representative Use Cases

Determine the average number of FP’s per Use Case

Determine the average size per Functional Process

There are numbers of reports that there is no such thing as a representative set of Use Cases

Introducing the Guideline for approximate COSMIC Functional Size Measurement

Early and Quick ®

Classification by analogy

Structured aggregation

Multilevel approach

fP fP fP fP fP fP

Layer “X”

Macro-P Macro-P

GP GP GP GP GP

FP FP FP FP FP FP

® The Early & Quick approach is a registered trademark of DPO

Introducing the Guideline for approximate COSMIC Functional Size Measurement

Let’s make progress together

Join the review

frankvogelezang@cosmicon.com

Space images courtesy of Maria Del Carmen Gutiérrez Herrero