Software Construction and Evolution - CSSE 375 Open Source 2 Shawn & Steve.

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Presentation transcript:

Software Construction and Evolution - CSSE 375 Open Source 2 Shawn & Steve

2 “Free” and “Open Source” Software  Free Software Foundation l Philosophy of Software Sharing l Social Movement l Stallmanism  Open Source Software l A Business Model l A Development Approach with Shared Software l Raymondism (Eric Raymond)  Both focus on access to source code

3 Some Raymondisms…  Treating your users as co-developers  Release early… Release often!  Treat your beta-testers as if they're your most valuable resource  The next best thing to having good ideas is recognizing good ideas from your users Q8

4  Independence – Levels the Playing Field  Access to all technical information, not only a vendor chosen subset  Any technical person has the same chance to become an expert as company employees  Competing commercial services available  Lower investment in time and money  No extra fees for advanced features like replication/free text search Open Source Advantages: Commercial Q9

5 Open Source Advantages: Community  Trains and exposes skilled developers  Find bugs faster, on more platforms  Additional testing, development, business intelligence, etc. resources  Win-Win-Win - original developers, end users, other software projects Linus' law: given enough eyeballs, all bugs are shallow Q9, cntd

6 Some Key Issues for OSS Project  Project/Code maturity  Programming language  Type of software developed  Intended audience  Reputation of participants  Licensing issues  Organizational involvement in the project

Evolving Software  Open Source Software tends to grow organically based on needs & contributions l Rather than economic games by business  Studies have found that the dependency structures of Open Source Software are similar to organisms (opportunistic) What do you think the impact will be on a largely cost controlled software economy? 7 Q10

8 Cool concept, but WIIFM*?  Exemplars - systems like the one you may have in mind to construct  Reuse - anything from wholesale reuse to design salvaging  Opportunity to contribute to the body of evolving software  Opportunity to interact with some of the best software engineering professionals in the business - Learn! *What’s in it for me?