There was usually only one research investigator, and the data consisted of descriptions, observations, impressions, unstructured interviews, and existing materials gathered at the site that were organized intuitively and informally.
The data collected by the research investigator proved very useful to his field.
mnli hypothesis: The data collected by the research investigator proved very useful to his field. premise: There was usually only one research investigator, and the data consisted of descriptions, observations, impressions, unstructured interviews, and existing materials gathered at the site that were organized intuitively and informally.