The purpose of the thesis at hand was to contribute to existent research on information seeking behaviour by identifying ongoing experts strategies for exploratory online information seeking in the field of scientific research. The setting up and answering of three research question enabled the identification of overall 8 strategies. In addition to the identification of general strategies, the study reveals that the organization of information seeking processes varies between fields of study. For matter of differentiation of organization types a matrix of 12 categories was developed among the two dimensions planning and documentation. The findings of the thesis extend the so far existing research on information seeking behaviour, especially through the studies focus on exploratory search and on the field of scientific online research. In practice, they might be useful for unexperienced searchers, i.e. students, as an orientation aid and best practice example. Also search service providers can benefit of the findings for an adaptation of their offerings to searchers needs. Further research is especially suggested with regards to the benefiting effect of networking, thus cooperation, and with regards to the differences found in the organization of information seeking processes per field of study.