A UML Tutorial Introduction

http://www.cragsystems.co.uk/ITMUML/index.htm

In this tutorial you will learn about the fundamentals of object oriented modelling, the Unified Modeling Language and the software development process

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The Open Source Definition | Open Source Initiative

http://www.opensource.org/docs/osd

Open source is a development method for software that harnesses the power of distributed peer review and transparency of process. The promise of open source is better quality, higher reliability, more flexibility, lower cost, and an end to predatory vendor lock-in.

The Open Source Initiative (OSI) is a non-profit corporation formed to educate about and advocate for the benefits of open source and to build bridges among different constituencies in the open-source community.