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Prominent examples include online encyclopedias such as (Semantic) MediaWikis, Question and Answering portals such as StackOverflow, and many others. Only a small fraction of these systems manage to reach self-sustaining activity, a level of activity that prevents the system from reverting to a nonactive state. In this article, we model and analyze activity dynamics in synthetic and empirical collaboration networks. Our approach is based on two opposing and well-studied principles: (i) without incentives, users tend to lose interest to contribute and thus, systems become inactive, and (ii) people are susceptible to actions taken by their peers (social or peer influence). With the activity dynamics model that we introduce in this article we can represent typical situations of such collaboration networks. For example, activity in a collaborative network, without external impulses or investments, will vanish over time, eventually rendering the system inactive. However, by appropriately manipulating the activity dynamics and\/or the underlying collaboration networks, we can jump-start a previously inactive system and advance it toward an active state. To be able to do so, we first describe our model and its underlying mechanisms. We then provide illustrative examples of empirical datasets and characterize the barrier that has to be breached by a system before it can become self-sustaining in terms of critical mass and activity dynamics. Additionally, we expand on this empirical illustration and introduce a new metric<jats:italic>p<\/jats:italic>\u2014the<jats:italic>Activity Momentum<\/jats:italic>\u2014to assess the activity robustness of collaboration networks.<\/jats:p>","DOI":"10.1145\/2873060","type":"journal-article","created":{"date-parts":[[2016,5,22]],"date-time":"2016-05-22T01:23:59Z","timestamp":1463880239000},"page":"1-32","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":10,"title":["Activity Dynamics in Collaboration Networks"],"prefix":"10.1145","volume":"10","author":[{"given":"Simon","family":"Walk","sequence":"first","affiliation":[{"name":"Institute for Information Systems and Computer Media, Graz University of Technology, Graz, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Denis","family":"Helic","sequence":"additional","affiliation":[{"name":"Knowledge Technologies Institute, Graz University of Technology, Graz, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Florian","family":"Geigl","sequence":"additional","affiliation":[{"name":"Knowledge Technologies Institute, Graz University of Technology, Graz, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Markus","family":"Strohmaier","sequence":"additional","affiliation":[{"name":"GESIS - Leibniz Institute for the Social Sciences and University of Koblenz-Landau, Cologne, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2016,5,20]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"crossref","unstructured":"Daniel M. 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