Opposites Attract: How Can the Flexibility of Open Source and the Assurance of Proprietary Software Coexist?

The time of full-throttle competition between Free Open-Source Software (FOSS) and Proprietary Software (PS) is now in the past. The interaction between these paradigms has changed course into a search for coherent models which unify, rather than separating, the main principles of the two. Enterprises which use heterogeneous information systems are hardly exotic; they are rather the norm - so it seems that these two systems, which exist side-by-side in reality, may not be the natural enemies that they appear to be at first glance.