What happened to the crossdisciplinarity of Technology-Enhanced Learning in 2004?

In a recent study the crossdisciplinarity of the field of Technology-Enhanced Learning was analysed with science-overlay-maps and diversity measures. Results reveal that the crossdisciplinarity of the field has constantly increased over the last 10 years. Only in 2004, a significant decrease of interdisciplinary research could be identified. In this paper we take a closer look at the publications of this year and test our hypotheses for the decrease of crossdisciplinarity