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Multilevel Collaboration between Software
Developers and the Impact of Proximity:
an Early, Preliminary Work	
  
Dawn Fost...
Goals for Today
Very early work – seeking feedback on
•  Best approaches for incorporating
multilevel concepts.
•  Fitting...
Research Overview
How do participants who are paid by
firms collaborate within a fluid
organization?
Proximity theory as a...
Contributions
Contribute to literature on fluid organizations by:
•  Determining the impact of firm affiliation on intraor...
Fluid Organizations
•  In fluid organizations, the boundaries and structures allow fluid
movement within the organization ...
Proximity Theory
•  Social proximity: relations between actors with trust coming from friendship and
experience (Boschma 2...
Empirical Setting: Open Source
•  Open source frequently studied as a fluid organization (e.g. Chen
& O’Mahony, 2009; O'Ma...
Collaboration Network
•  Network ties: Mailing Lists – ego replies to alter
–  Collaboration for code review, patch feedba...
Multilevel Network
•  Individual / Organizational / Mailing List Levels
–  Employers pay developers to enable firm’s produ...
Operationalizing Proximity
Using Boschma’s (2005) 5 dimensions of proximity
•  Organizational:
–  Operationalized as firm ...
Dataset
•  Subset for testing multilevel analysis – 2 years
•  Dates:
–  2013-11-01 (complete dataset: 2006-03-20 first LT...
Relational Event Models
•  Relational event models provide a “highly flexible framework for
modeling actions within social...
Effects: Dyadic P-Shifts, Recency
13	
  
Illustra3ons	
  by	
  	
  
Carter	
  Bu;s,	
  	
  
Sunbelt	
  2015	
  
Results - Series of difficulties
•  REM model struggled with number of events:
–  Reduced to first 500 events (1.5 days) t...
Preliminary Results
15	
  
Preliminary Results
•  Model not yet complete: Testing the waters now.
–  tiny number of events won’t represent whole.
–  ...
Future Developments / Feedback
•  We know the Model has issues:
–  Get feedback on what we have done so far and on
fitting...
Thank You and Questions
Authors:	
  
	
  
Dawn	
  M.	
  Foster	
   	
  D.M.Foster@greenwich.ac.uk	
  	
  	
  	
  
	
  
Gui...
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Multilevel Collaboration between Software Developers and the Impact of Proximity: an Early, Preliminary Work

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Multilevel Collaboration between Software Developers and the Impact of Proximity: an Early, Preliminary Work

  1. 1. Multilevel Collaboration between Software Developers and the Impact of Proximity: an Early, Preliminary Work   Dawn Foster, Guido Conaldi, Riccardo De Vita University of Greenwich Centre for Business Network Analysis http://www.gre.ac.uk/business/research/centres/cbna/home
  2. 2. Goals for Today Very early work – seeking feedback on •  Best approaches for incorporating multilevel concepts. •  Fitting a suitable model for multilevel networks. •  What we have done so far. 2  
  3. 3. Research Overview How do participants who are paid by firms collaborate within a fluid organization? Proximity theory as a theoretical framework: •  to understand intraorganizational collaboration •  within fluid organizations •  using an open source software project, the Linux kernel, as the empirical setting. 3  
  4. 4. Contributions Contribute to literature on fluid organizations by: •  Determining the impact of firm affiliation on intraorganizational collaboration between individuals in fluid organizations. –  Existing studies on open source mostly individual motivations. –  Firms can influence collaboration of employees. •  Demonstrating that proximity theory can be used to better understand collaboration within fluid organizations. –  Boschma’s (2005) five dimensions should further our understanding. –  Most proximity studies are inter; Fluid boundaries blur distinction. As fluid organizations become more common, understanding collaboration within them is increasingly important. 4  
  5. 5. Fluid Organizations •  In fluid organizations, the boundaries and structures allow fluid movement within the organization as individuals collaborate to coordinate activities (Ashkenas et al., 2002; Glance & Huberman, 1994). •  Some fluid organizations are based on global virtual work across many time zones by people from different backgrounds (Nurmi & Hinds, 2016) and may include individuals from different firms and different types of institutions (O’Mahony & Bechky, 2008). •  Collaboration, especially within fluid organizations, crosses dimensions of proximity, including cognitive, organizational, social, institutional and geographical, which can be used to better understand collaboration (Balland, 2012; Boschma, 2005; Cantner & Graf, 2006; Crescenzi, Nathan, & Rodríguez-Pose, 2016; Knoben & Oerlemans, 2006). 5  
  6. 6. Proximity Theory •  Social proximity: relations between actors with trust coming from friendship and experience (Boschma 2005). •  Institutional proximity: whether individuals collaborate more with others in a similar institutional setting, like corporation, non-profit, university, non-affiliated, etc. (Balland 2012; Crescenzi et al. 2013). •  Organizational proximity: relationship within an organizational structure (Boschma 2005) and to look at collaboration within and between orgs. •  Cognitive proximity: similarity of frames of reference and knowledge (Knoben & Oerlemans 2006). •  Geographic Proximity: physical, spatial distance between actors (Boschma 2005). Online, geographical proximity is often irrelevant, but others have used a temporal measure (time zones) (O’Leary & Cummings, 2007). 6  
  7. 7. Empirical Setting: Open Source •  Open source frequently studied as a fluid organization (e.g. Chen & O’Mahony, 2009; O'Mahony & Bechky, 2008; Puranam et al., 2014) •  Contributions by individuals, not firms (O’Mahony, 2007), but firms are increasingly paying employees to contribute as a way to participate (Jensen & Scacchi, 2007; Roberts et al., 2006). •  Linux Kernel1: –  < 8% of contributions by unpaid software developers –  Neutral project, competing companies participate –  22 million lines of code –  14,000 developers –  1,300 organisations 7   Linux Kernel Computer Hardware (CPU, memory, disk) Linux Operating System (Red Hat, Ubuntu) Applications (web browser, office)SystemonlyUserfacing 1 Corbet & Kroah-Hartman, 2016  
  8. 8. Collaboration Network •  Network ties: Mailing Lists – ego replies to alter –  Collaboration for code review, patch feedback, bugs & discussions are on mailing lists before source code is accepted into repository. •  “The mailing lists are still the primary communications space.” •  “All of our collaboration happens over discussing patches.” 8  10 Mailing Lists 2015-01-27 90 days k-core>=10
  9. 9. Multilevel Network •  Individual / Organizational / Mailing List Levels –  Employers pay developers to enable firm’s products, gain influence and set direction, share information, more. –  Most consider affiliation with the Linux kernel community to be more important than their employer. –  Almost all contributions come from paid software developers. –  Collaboration occurs in 200+ mailing lists simultaneously. •  How does firm affiliation with an organization shape collaboration of individuals? •  How do mailing lists enable collaboration? 9  
  10. 10. Operationalizing Proximity Using Boschma’s (2005) 5 dimensions of proximity •  Organizational: –  Operationalized as firm affiliation (company) or unaffiliated (hobbyist, etc.) •  Cognitive: –  Usually measured based on shared knowledge / technologies –  Operationalized as contributing to areas of the source code (subsystems) •  Geographic: –  Usually measured based on physical location, less relevant for online collaboration. –  Operationalized using time zones (temporal geographic proximity) •  Institutional: –  Operationalized based on employment by firm, academia, or unaffiliated •  Social: –  Often measured using collaboration network (seems like double counting) –  Operationalized by # of times dyad participated in same mailing list threads10  
  11. 11. Dataset •  Subset for testing multilevel analysis – 2 years •  Dates: –  2013-11-01 (complete dataset: 2006-03-20 first LTS release) –  2015-11-01 – date of 4.3 release –  15, 30, 45, 60, 75, 90 day moving windows •  Mailing Lists: –  19 of the top mailing lists (over 200), excluded top mailing list –  226,919 messages (out of 2,818,774 for top 20, all dates) •  Source Code: –  Linux-stable tree –  177,113 commits (out of 603,006 for all dates) 11  
  12. 12. Relational Event Models •  Relational event models provide a “highly flexible framework for modeling actions within social settings, which permits likelihood-based inference for behavioral mechanisms with complex dependence.” (Butts, 2008, p. 155) •  Based on relational events, or actions generated by sender directed toward a receiver. Represented by sender, receiver, action type and time (Butts, 2008). •  Mailing list data with a time stamp for each message provides useful data for relational event models. •  Each reply to a mailing list post can be thought of as an event created by a sender targeted at a receiver. •  Used to explain likelihood of collaboration between 2 developers given influence of dimensions of proximity and other effects. 12  
  13. 13. Effects: Dyadic P-Shifts, Recency 13   Illustra3ons  by     Carter  Bu;s,     Sunbelt  2015  
  14. 14. Results - Series of difficulties •  REM model struggled with number of events: –  Reduced to first 500 events (1.5 days) to get the model to run (used first 200 events as control, ran model with 300 events) –  Takes 6+ hours to estimate 600 events (3 days) on a big server. –  Might have to do with the way we are loading variables into the model. –  Possible other limitations with the REM model / Relevent software 14  
  15. 15. Preliminary Results 15  
  16. 16. Preliminary Results •  Model not yet complete: Testing the waters now. –  tiny number of events won’t represent whole. –  missing variables likely to change these results. –  need to analyze per mailing list (mailing list level) •  Proximity looks promising as theoretical framework –  Org prox - less likely to reply to other employees. Do they use internal corporate channels to collaborate? –  Cognitive prox – more likely to reply to people working in same areas of code. –  Geo prox – less likely to reply as tz difference increases 16  
  17. 17. Future Developments / Feedback •  We know the Model has issues: –  Get feedback on what we have done so far and on fitting a suitable model for multilevel networks. •  Multilevel: Both aspects need to be developed: –  Multilevel analysis of networks: multiple mailing lists at the same time (like classrooms within schools) •  Mailing lists as levels? How do we do this? –  Analysis of multilevel networks: complex models for networks - modeling organizational affiliation as a level. •  Can we treat organizations as a level, instead of as an attribute of developers? •  Need to look at org level to see interactions by organization. •  Relational Event Models: –  Options for modeling large event sequences in networks. 17  
  18. 18. Thank You and Questions Authors:     Dawn  M.  Foster    D.M.Foster@greenwich.ac.uk           Guido  Conaldi      G.Conaldi@greenwich.ac.uk     Riccardo  De  Vita    R.DeVita@greenwich.ac.uk       University  of  Greenwich,  Centre  for  Business  Network  Analysis   h;p://www.gre.ac.uk/business/research/centres/cbna   18  

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