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First Quartile 1 1<br />

Median 1 1<br />

Mean 1.5 3.5<br />

Third Quartile 1 3<br />

Maximum 147 147<br />

Average Edge Weight Distribution<br />

First Quartile 1 1.4<br />

Median 1 2.1<br />

Mean 1 2.6<br />

Third Quartile 1.32 3<br />

Maximum 12.3 14<br />

The network representing the entire cohort is loosely coupled, highly decentralized, and characterized<br />

by most individuals located in smaller interconnected parts of the network that are linked by several<br />

individuals who co-participate in these otherwise disparate clusters. The regular participants network<br />

is similar in structure. However, the network is much more centralized than the all learners network<br />

with a degree value of 0.81 and 0.23 respectively. The closer the centralization measure is to ‘1’, the<br />

more highly centralized the network is, and marked by the clear boundary between its core and<br />

periphery (Scott, 2013). Given network’s power-law distribution and low betweenness value, one can<br />

assume that those who participated in most conversations, i.e. having high brokering power, would<br />

also be connected to the highest number of people (degree). Besides being brokers between<br />

conversations, they would also shorten the distance between the regular participants, as well as<br />

control much of the information within the network thereby explaining the differences in the observed<br />

network centrality measures.<br />

The pattern of development for the networks representing the entire cohort and more regular<br />

participants (both student-only and students-and-staff interactions) has been consistent up until Stage<br />

3 (Figure 4). The network of the entire cohort retained its low density and low closeness centrality<br />

indicating that individuals were only connecting with a few people, and the network members were<br />

sparsely distributed. The period between Stage 1 and Stage 2 is marked by a growth in the degree<br />

and betweenness centrality measures. Such a dynamic signifies an increase in the network<br />

centralization post week 1 due to the emergence of more active participants. In contrast, regular<br />

participants network shows a steady change in structure from a loose to a more inter-connected<br />

network. Although its density remained low at all time points, its value is much higher for regular<br />

participants without staff and CAs suggesting that the regular participants activated more possible<br />

connections between each other, than those students participating infrequently. The much higher<br />

centralization and closeness of the regular participants network as compared to the same network<br />

without the staff and CAs points to the role played by this dedicated group of people. The staff and<br />

CAs provided a bridge between the structural holes in the network, thereby significantly reducing the<br />

distances among the actors. In conclusion, while still maintaining a loosely coupled structure, the<br />

regular participants formed stronger relational ties among its central actors and established their wide<br />

outreach to loosely interconnected periphery. Such a structure is reflective of the developmental<br />

stages of a community of practice.<br />

229<br />

FP:217

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