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Open Source for an Open World
- 1. Open Source Software in an Open World Elizabeth B. Thomsen Member Services Manager North of Boston Library Exchange [email_address]
- 2. Hello, World! 10 PRINT “Hello World!” 20 END Software is easy!
- 3. “Software is hard.” Donald Knuth “The Art of Computer Programming” 1962
- 4. “Why can’t we design software the way we build bridges?”
- 5. The Impossibility of Complete Testing We can’t test all the inputs to the program. We can’t test all the combinations of inputs to the program. We can’t test all the paths through the program.
- 6. (More Impossibility) We can’t test for all of the other potential failures, such as those caused by user interface design errors or incomplete requirements analyses. (Cem Kaner, author of ‘Bad Software”)
- 7. User Error Foolproof programs? “It’s impossible to make anything foolproof because fools are so ingenious” “We thought it was foolproof but then along came another fool.” Software is designed for people
- 8. SongTapper Tap a song for a partner – can they guess what it is? (http://www.songtapper.com)
- 9. Curse of Knowledge Elizabeth Newton’s song-tapping experiment: Predicted guessing rate: 50% Correct guessing rate: 3%
- 10. Communication Problems Between all parties At all levels At all phases of the process Include communication errors in programming
- 11. Troubleshooting Trouble Eyewitness accounts notoriously unreliable The human brain isn’t a recording device In normal use, you have no idea what exactly you did just before that bad thing happened
- 12. What Does This Mean? Lots of bugs hiding under unintended user behavior Lots of legitimate bugs are dismissed as user error (even by users) Design flaws are not bugs, but might as well be
- 13. Brooks’s Law “ Adding manpower to a late software project makes it later” “ The Mythical Man-Month” Frederick P. Brooks, Jr. (1975)
- 14. According to Brooks… Each new member of a team must be brought up to speed and adds to the communication and coordination burden “The bearing of a child takes nine months, no matter how many women are assigned to a task.” Logical conclusion: ideal size of team=1
- 15. A Different Approach… Collaborative projects of developed and supported by self-organizing communities of interest Transcend geography, time zones Roles based on participation, contribution and trust, not formal credentials
- 16. Pyramid of Participation Casual observer Occasional contributor Core Contributor Moderator / Module Owner / Administrator Board Member Benevolent Dictator
- 17. Self-Organizing Communities Self-organizing doesn’t mean disorganized Participants seek and find roles that are appropriate to their talents, interests and personal needs Participants earn their place in the community
- 18. Motivation and Compensation People do things for all kinds of reasons Intrinsic rewards are more motivating than extrinsic rewards Altruism, personal satisfaction, prove and improve skills, cooperation/competition, future reward, social interaction Be part of something
- 19. Collaborative Communities Have always existed in some form… But the Internet transformed the way people can engage in discussion and collaborative projects
- 20. Active Communities Health and disability support groups Political activity Fan communities “ Survivor” spoilers Wikipedia : open source encyclopedia (truly collaborative rather than collective)
- 21. Economic Impact Fewer people watching televisions, especially in the 18-34 demographic Fewer people reading newspapers Consumer ratings, reviews, blog postings sometimes more powerful than advertising (Example : blogging foodies)
- 22. Free/Open Source Software Grew out of the old hacker culture of the 1960’s and 1970’s Students working on UNIX systems; minicomputers Computers club culture around the Altair and other early hobby computers
- 23. Bill Gates’ Open Letter 1976 Sent to the Homebrew Computer Club complaining about unauthorized copying of Altair BASIC: “ you…prevent good software from being written. Who can afford to do professional work for nothing?”
- 24. Free Software Free Software Foundation (1985) “ Think of free speech, not free beer” GNU Project : full operating system Linus Torvald’s Linux provided the kernel
- 25. Four Freedoms Freedom 0 : The freedom to run the program for any purpose Freedom 1 : The freedom to study and modify the program
- 26. Freedom 2 : The freedom to improve the program so you can help your neighbor Freedom 3: The freedom to improve the program, and release your improvements to the public, so that the whole community benefits
- 27. Source Code Access Freedoms 1 (study/modify) and 3 (improve/release) are only possible with the source code Source code invaluable as a learning tool, but also for security and for improvement Academic tradition: release research Rapid evolution
- 28. Open Source Movement 1998: Netscape’s release of Navigator source code as Mozilla Possibly confusion and political emphasis of “free software” terminology Some disputed areas between groups, much common ground in principle and practice
- 29. “The Cathedral & the Bazaar” Eric S. Raymond, 1997 Contrasts building of cathedrals (highly centralized) and bazaar “a great babbling bazaar of differing agendas and approaches”
- 30. Open Source Approaches Users should be treated as co-developers Early releases (find co-developers early) Frequents integration (often nightly builds) At least two versions (development/stable) Modularization (parallel development) Dynamic decision-making structure
- 31. Richard Stallman
- 32. Linus Torvalds
- 33. Eric Raymond “ Everybody Love Eric Raymond” http:// geekz .co. uk / lovesraymond /
- 34. Business and Open Source Open source is not incompatible with business IBM, Sun and other businesses have chosen to participate in open source projects, donating both existing software and programmers Choose to build their applications on top of open source bases software like Apache
- 35. New Business Opportunities Businesses charge for installation, customization and support of open source products Businesses develop value-added compatible software products
- 36. Complex Legal Issues Open source coming of age Microsoft asserting patent infringements and making settlement offers with Novell and others GPL3: Patent pledge to Novell extends to all Linux
- 37. Libraries and Open Source Open Source Software: Freedom to read? Community-based software: Compatible with public and educational institution philosophies : resource sharing, examination and evaluation of sources May provide longterm stability
- 38. Workstation Level Open source operating systems now ready for prime time Library patrons becoming familiar with the concept of open source software; may appreciate savings Introduction of Vista a time for re-evaluation
- 39. Open Source Library Systems Georgia Pines system using Evergreen brought major attention to Open Source as a viable option even for a very large library system Instability in the ILS market makes this a good time to re-evaluate options Competition and choice from outside likely to be good for the ILS vendors and for customers
- 40. My Prediction The next two years are going to be very interesting. So is the rest of today Enjoy!
- 41. Elizabeth B. Thomsen Member Services Manager NOBLE: North of Boston Library Exchange [email_address]