4. Data From Tenopir & King 18,000+ scientists and social scientists 1977 to present University and non-university workplaces Mostly North America Recent studies of Astronomers, Medical faculty, faculty and students at several universities

5. Three Types of Data Demographic Estimates of behavior Details of last reading

6. Articles: can include those found in journal issues, Web sites, or separate copies such as preprints, reprints, and other electronic or paper copies.

7. Readings: going beyond the table of contents, title, and abstract to the body of the article.

8. Average Articles Read per Scientist Average number of articles read per scientist Year of Studies www.dlib.org/dlib/october03/king/10king.html

9. Scholarly Article Reading Work FieldArticles Read (Per Year) Time Spent (Hours) Time Per Article (Min) Univ. Med.~32211822 Chemists~27619843 Life Scientists~23910426 Physicists~20415345 Soc Sci/Psych~19112138 Engineers~729781

10. Average Annual Amount of Reading

11. Average Annual Amount of Time (Hours) Spent Reading (Hrs)

12. Purpose and Ranking of Importance: University Medical Primary Research29.9% Current Awareness22.1% Teaching16.9% Writing11.7% Other Purpose9.0% Background6.5% Consulting / Advising3.9% #3 #1 #7 #6 #5 #2 #4

13. Average Number of Personal Subscriptions to Scholarly Journals

14. Personal Subscriptions All studies average 2.2 All UT science faculty average 3.8 Medical faculty average 6.3

15. Sources of Readings Astronomers Medical Faculty Universities 42.9 % 21.4 % 35.7 % 22.1 % 15.6 % 62.3% 49 % 36 % 15 %

16. Print or Electronic Astronomers Medical Faculty Universities 80 % 20 % 75 % 25 % 63 % 37 %

17. 62.3% 20.8% 16.9% MeansofLearningAboutArticlesRead Means of Learning About Articles Read Medical Faculty 39% 21% 37% Astronomers 22% 29% 49% Universities

18. Educational DegreePrintElectronic M.D., only331 Ph.D., only1817 Both M.D. and Ph.D.10 Neither degree40 Total5618 FormatofReading Format of Reading

19. Astronomy Articles Read per Month vs. Productivity

20. Awareness and Use of ADS by Productive PhD Astronomers

21. Awareness and Use of ADS by not-Productive PhD Astronomers

22. Average Time Spent Reading Per Article by Astronomers U.S. astronomers (n=306) average 36 minutes Non-U.S. astronomers (n=83) average 43 minutes

23. Source of Reading by Astronomers

24. Tenopir and King, Communication Patterns of Engineers, NY: IEEE/Wiley, 2004

25. Use and Users of Electronic Library Resources: An Overview and Analysis of Recent Research Studies www.clir.org/pub/reports/pub120/pu b120.pdf

26. Patterns of Journal Use by Faculty at Three Diverse Universities. October 2003 http://www.dlib.org/dlib/october03/ki ng/10king.html

27. Future Studies Pediatricians University faculty and students in Australia University faculty and students in Finland Scientists in Chile and Brazil Tenopir & King surveys also being replicated in Cuba and Argentina