1. Open Source Evolution

• • Nguyen Vu Hung

• Tokyo 2007/06/24

2.

FOSS definition

FOSS examples

FOSS processes

FOSS technologies

FOSS quality

FOSS architecture

FOSS business models

Further readings

Outline 3.

FOSS: Free and Open

Source Software.

free software = liberty, not price.

Freedom to:

Runthe program.

Study, adapt . Source code is a must.

Redistribute/Copy .

Improve/Releaseimprovements.

FOSS Definition Open source is a development method for software that harnesses the power of distributed peer review and transparency of process. 4. FOSS Examples

GCC ( GNU C compiler )

Linux ( Operating System )

Eclipse ( de facto IDE )

KDE ( Desktop Environment )

Apache / PHP / MySQL

Firefox( Web browser )

5.

Global collaboration

• Members all over the world.

• Developers = users = testers.

Distributed change management

• Use branches in CVS.

• Share-development.

Iterative development

• Short dev cycle.

• Unstable releases.

• Decentralized testing.

• Remote quality assurance.

Process User satisfaction can improve and be driven by shortening the time interval between releases 6.

Fast exploitation

• Share/try new ideas.

• Community help testing.

New topics

• Basically anything new.

• Community is important.

Modeling feedback control system(?)

Technology 7.

Source code availability:

• Fast/effective defect-correction cycle

• • Fast feedback by users = developers = testers.

• High security assurance

• • White testing

• • Code review

• • Free testers

Quality Given enough eyeballs, all bugs are shallow. The promise of open source is better quality, higher reliability, more flexibility, lower cost, and an end to predatory vendor lock-in. 8.

Evolutionary ( hackerish? ) designs

• No design at all.

• Read the code! No doco.

Modularized components

• Mozilla extensions.

• Linux kernel modules.

• Eclipse plug-ins.

Architecture Reduce software complexity. Encourage developers.

• because software

• change too fast.

9.

Distribution model

New services = $$$

• Packaging.

• Technical supports.

• Customization.

• Refactoring.

Business Model Test tree vs. production tree? ( RH ) 10.

Modeling feedback control system.

Social aspects.

Economical aspects.

Further readings 11. Thank you. Q & A 12. Ref

The Free Software Definitionhttp://www.gnu.org/philosophy/free-sw.html

http://opensource.org/

Christof Ebert,Open Source Drives Innovation

Nazim H. Madhavji et al, SOFTWARE EVOLUTION AND FEEDBACK