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The objectives of the study were to conduct a series of observations and experiments under as real-life a situation as possible related to: (i) user context of questions in information retrieval; (ii) the structure and classification of questions; (iii) cognitive traits and decision making of searchers; and (iv) different searches of the same question. The study is presented in three parts: Part I presents the background ot the study and describes the models, measures, methods, procedures, and statistical analyses used. Part II is devoted to results related to users, questions, and effectiveness measures, and Part III to results related to searchers, searches, and overlap studies. A concluding summary of all results is presented in Part III. © 1988 John Wiley & Sons, Inc.
Saračević et al. (1988) studied this question.