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Purpose. This article examines characteristics of the external environment of library and information centres of Islamic Azad University in Iran, focusing on perceived environmental uncertainty and perceived source accessibility and quality, and their impacts on the amount of scanning and the frequency of information source use. Methods This research surveyed the library managers of ninety-four units of Islamic Azad University. Data were collected by a mail questionnaire with a response rate of 90.42%. Findings. Results show that there is a positive correlation between respondents’ perceived environmental uncertainty and the amount of scanning. Additionally, perceived source accessibility and quality are associated more with frequency of information source use in environmental scanning than with perceived environmental uncertainty; and managers mostly rely on personal and internal information sources. Conclusion. This research shows that: libraries as organizations are sensitive to their external environments, and variable, complex and important events occurred in it; managers of academic libraries feel uncertainty and complexity in their decision making and rely on information sources; and the use of library and electronic information services as information source in environmental scanning ranked in a high level compared to other sources. [ABSTRACT FROM AUTHOR]

"Importance, variability and complexity" are more common characteristics of organizations' external environment. Managers scan the external environment in order to acquire information about events and incline to plan the organization's future courses of action. This study aims first, to investigates the manner that library and information center managers of Islamic azad University (IAU) perceived the "Importance, variability and Complexity" of the environmental sectors; and secondly, it aims to calculate the "perceived Strategic Uncertainty (PSU)" and the "perceived environmental Uncertainty (PEU)", and to account their correlation with the amount of scanning in each environmental sector. Populations of this survey are library and information center managers of large and very large units of IAU, consisting of 94 units of 232 in total. Data are collected by questionnaires by mail and face to face interviews. Results indicate that the amount of scanning is related to the perceived strategic uncertainty (range from 0.339 to 0.745) and perceived environmental uncertainty (range from 0.607 to 0.770); that is PSU and PEU of each environment sector strongly correlates with the amount of scanning. In the field of library and information centers acting as service base organizations, managers who scan the environment, customers, and technologic sectors are perceived as important, variable and complex. The great mean value of competition (mean = 3.88) in the field of complexity shows the complexity of this sector and numerous factors in the field of information services. [ABSTRACT FROM AUTHOR]