StackOverflow and GitHub: Associations Between Software Development and Crowdsourced Knowledge
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1 StackOverflow and GitHub: Associations Between Software Development and Crowdsourced Knowledge Bogdan Vasilescu Vladimir Filkov Alexander Serebrenik TU Eindhoven UC Davis
2 Standing on the shoulders of others Developers: reuse components and libraries forage on the Web for information
3 Standing on the shoulders of others Developers: reuse components and libraries forage on the Web for information
4 Standing on the shoulders of others Developers: reuse components and libraries forage on the Web for information
5
6 Writing code vs. seeking and sharing knowledge Demand for knowledge Supply of knowledge
7 Is participation in SO related to productivity of developers?
8 Is participation in SO related to productivity of developers? Beneficial: good technical solutions! [Parnin et al. Crowd documentation: Exploring the coverage and the dynamics of API discussions on Stack Overflow, Georgia Institute of Technology, Tech. Rep., 2012] fast answers (median 11 mins) [Mamykina et al. Design lessons from the fastest Q&A site in the west, in CHI. ACM, 2011, pp ]
9 Is participation in SO related to productivity of developers? Detrimental: competes for time! gamified, thus addictive! [Storey et al. The impact of social media on software engineering practices and tools, FoSER. ACM, 2010, pp ] [Deterding, Gamification: designing for motivation, Interactions, vol. 19, no. 4, pp , 2012] context switches are expensive [Bacchelli et al. Harnessing Stack Overflow for the IDE, in RSSE. IEEE, 2012, pp ]
![359 364] [Deterding, Gamification: designing for motivation, Interactions, vol. 19, no. 4, pp.](/docs-images/45/4696261/images/page_9.jpg "14 17, 2012] context switches are expensive [Bacchelli et al. Harnessing Stack Overflow for the IDE, in RSSE. IEEE, 2012, pp.")
10 Is participation in SO related to productivity of developers? Asset or burden?
11 Dataset Largest code host in the world Largest programming Q&A site in the world ~400k users July April 2012 ~1.3M users July August 2012 [G. Gousios and D. Spinellis. GHTorrent: Github s data from a firehose, in MSR. IEEE, 2012, pp ] [Quarterly StackExchange data dump (August 2012)]
12 Dataset?! July April 2012 July August 2012 [G. Gousios and D. Spinellis. GHTorrent: Github s data from a firehose, in MSR. IEEE, 2012, pp ] [Quarterly StackExchange data dump (August 2012)]
13 Dataset address (plain text) address (MD5 hash)?! July April 2012 July August 2012 [G. Gousios and D. Spinellis. GHTorrent: Github s data from a firehose, in MSR. IEEE, 2012, pp ] [Quarterly StackExchange data dump (August 2012)]
14 Dataset address (plain text) address (MD5 hash) (24%) ~94k users (7%)! July April 2012 July August 2012 [G. Gousios and D. Spinellis. GHTorrent: Github s data from a firehose, in MSR. IEEE, 2012, pp ] [Quarterly StackExchange data dump (August 2012)]
15 Dataset address (plain text) address (MD5 hash) (12%) (4%) ~47k users active! on both GitHub and StackOverflow between July April 2012 July April 2012 July August 2012 [G. Gousios and D. Spinellis. GHTorrent: Github s data from a firehose, in MSR. IEEE, 2012, pp ] [Quarterly StackExchange data dump (August 2012)]
16 Is participation in SO related to productivity of developers? Asset or burden?
17 Macro: overall activity levels To what extent can activity (expertise) on one platform be used as a proxy for activity (expertise) on the other? social signals (e.g., open source projects, professional social media) ~ career advancement [Capiluppi et al. Assessing technical candidates on the social web, IEEE Software, vol. 30, no. 1, pp , 2013]
18 Intermediate: working rhythms Is attention focused (bursts of commits) or divided between the two platforms? working rhythms of developers ~ software quality [Eyolfson et al. Correlations between bugginess and time-based commit characteristics, Empirical Software Engineering, pp. 1 31, 2013]
19 Micro: coordination between commits and Q&A Do StackOverflow activities accelerate or slow down GitHub commits? [Storey et al. The impact of social media on software engineering practices and tools, FoSER. ACM, 2010, pp ]
20 Macro Overall activity #Commits #Questions #Answers Dave Stuart Kevin
21 Macro Overall activity #Commits #Questions #Answers Dave Kevin Stuart
22 Macro Overall activity Fix, sort Quartiles/Deciles, compare #Commits #Questions #Answers Dave Kevin Stuart Not restricted to monotonic relations!
23 Findings Q2 Q3 Q4 Active GitHub committers are experienced developers: few StackOverflow questions many StackOverflow answers Q1 Quartiles (#Commits) Compare #Questions Q1 Q2 Q3 Quartiles (#Commits) Compare #Answers Q4
24 Findings Q2 Q3 Q4 Active GitHub committers are experienced developers: few StackOverflow questions many StackOverflow answers Q1 Quartiles (#Commits) Compare #Questions Q1 Q2 Top StackOverflow users are superstars rather than slackers! Quartiles (#Commits) Compare #Answers Q3 Q4
25 Findings Q2 Q3 Q4 Active GitHub committers are experienced developers: GitHub activity ~ few StackOverflow questions many StackOverflow answers Q1 Quartiles (#Commits) Compare #Questions StackOverflow willingness to answer technical questions (expertise) Q1 Q2 Top StackOverflow users are superstars rather than slackers! Quartiles (#Commits) Compare #Answers Q3 Q4
26 Intermediate Working rhythms Committing rhythm: series of inter-commit time intervals [Xuan et al. Measuring the effect of social communications on individual working rhythms: A case study of open source software, in Social Informatics. ASE/IEEE, 2012] Gini (Committing rhythms): focused vs. distributed attention Gini (Committing rhythms) #Q #A C A C C A C C C A 5 50 C Q Q Q C C C Q C 75 15
27 Findings Asking questions on StackOverflow influences how developers distribute their GitHub commits: heavy askers: bursts of intense commit activity followed by longer periods of inactivity (focused attention)
28 Findings Asking questions on StackOverflow influences how developers distribute their GitHub commits: Learning from StackOverflow (by asking) and heavy askers: bursts of intense commit committing to GitHub activity followed by longer periods of inactivity (focused attention)
29 Micro Who benefits from participating in SO Dave [Xuan et al. Measuring the effect of social communications on individual working rhythms: A case study of open source software, in Social Informatics. ASE/IEEE, 2012]
30 Micro Who benefits from participating in SO Dave [Xuan et al. Measuring the effect of social communications on individual working rhythms: A case study of open source software, in Social Informatics. ASE/IEEE, 2012]
31 Micro Who benefits from participating in SO Dave [Xuan et al. Measuring the effect of social communications on individual working rhythms: A case study of open source software, in Social Informatics. ASE/IEEE, 2012]
32 Micro Who benefits from participating in SO Dave Compare actual and shuffled series: actual < shuffled: acceleration actual > shuffled: impediment [Xuan et al. Measuring the effect of social communications on individual working rhythms: A case study of open source software, in Social Informatics. ASE/IEEE, 2012]
33 Findings
34 Findings For active committers, asking and answering questions on StackOverflow catalyses committing on GitHub. For no group is participating in StackOverflow detrimental!
35 Summary: Is participation in SO related to productivity of GitHub dev s? Asset or burden?
36 Summary Experts are experts Active committers are also active answerers (knowledge providers) on! Different working rhythms for novices (focused attention) and experts! everywhere! Going to is costlier for novices! Participating in reinforces commit activities on asset or burden
37 Summary Active committers are also active answerers (knowledge providers) on! Different working rhythms for novices (focused attention) and experts! Experts are experts everywhere! Going to! is costlier for novices Participating in reinforces commit activities on asset or burden
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