The second conference, also at Allerton, would follow a year later. These first two PLoP conferences witnessed a handful of organizational patterns: In James Coplien and Doug Schmidt, eds., Pattern Languages of Program Design. Addison-Wesley, 1995, pp. 259 - 291. In James Coplien and Doug Schmidt, eds., Pattern Languages of Program Design. Addison-Wesley, 1995, pp. 293 - 320. A flurry of associated publications and follow-up articles followed quickly thereafter, including an extemporization of the organizational patterns approach in the Bell Labs Technical Journal,  an invited piece in ASE,  a CACM article by Alistair Cockburn  and, shortly thereafter, a pattern-laden book by Alistair,  as well as chapters by Benualdi  and Janoff  in the "Patterns Handbook." It was also about this time that Michael A. Beedle et al. published patterns that described explicit extensions to existing organizational patterns, for application in projects using a then five-year-old software development framework called Scrum. A few more articles, such as the one by Brash et al.  also started to appear. Little more happened on the organizational patterns front until the publication of the book by Berczuk et all on configuration management patterns;  this was a break-off effort from the effort originally centered at Bell Labs. In the meantime, Jim Coplien and Neil Harrison had been collecting organizational patterns and combining them into a collection of four pattern languages. Most of these patterns were based on the original research from Bell Laboratories, which studied over 120 organizations over the period of a decade. These empirical studies were based on subject role-play in software development organizations, reminiscent of the sociodramas of Moreno's original social network approach. However, the pattern language also had substantial input from other sources and in particular the works by Cockburn, Berczuk, and Cunningham. This collection was published as "Organizational Patterns of Agile Software Development" in 2004. One of the most recent organizational pattern articles comes from an early pattern contributor and advocate, the object design pioneer Grady Booch. Like other patterns, organizational patterns aren't created or invented: they are discovered (or "mined") from empirical observation. The early work on organizational patterns at Bell Laboratories focused on extracting patterns from social network analysis. That research used empirical role-playing techniques to gather information about the structure of relationships in the subject organization.