As a graduate of an online doctoral program (yes, in clinical psychology) and a former campus-based but now current online instructor, I find the "debate" about online learning rather curious.
It is just a different teaching modality, no more no less. Take your pick: discovery-based learning, student-centered, constructivist, hands-on, self-study ... the list goes on and on ... there is a seemingly endless variety of learning "packages." None are one-size-fits-all.
It seems that people want some sort of definitive yes or no answer about whether online learning is "just as good" as the conventional campus-based variety.
But it doesn't take a longitudinal, factor analyzed, metanalysis to recognize the core differences: online delivered classes required consistent engagement of student and instructor and therefore also require a higher level of self-motivation. (It also helps to be a fairly proficient reader and writer.)
Is this "better" learning? For some yes, for some no.
In this forum, however, a larger concern does appear to be whether clinical psychology skills can be taught via distance learning. Given the fact that the major distance learning clinical programs all require face-to-face "residencies" this is a bit of a red herring. Yes, the legitimate next question is "Are the residencies adequate?" but that same question could be posed to a variety of campus-based programs. One can graduate from a predominently research PhD program in psychology and still be licensed (assuming completion of adequate supervised practice hours) but the underlying education would not have incorporated much "hands-on" therapy practice. (Of course, given their different emphasis, there could be an entire debate over whether PsyDs are much better prepared clinicians than any PhD.)
In my N=1 personal sample, in two years of practicum and internship, I never had my therapeutic or assessment skills criticized or even questioned. (Though a fellow intern from an APA accredited campus based program did need remediation for assessment skills.)
Online learning -- like college in general -- is not for everyone.
But it is a viable means of advancing one's education.
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For psisci,
A very basic EBSCOhost search for "online education" returned 388 hits. (Selected bibliography follows).
Barry, M., and Runyan, G. (1995). A review of distance learning studies in the U.S. military.
The American Journal of Distance Education, 9 (3): 3747.
Carey, J. M. (2001). Effective Student Outcomes: A Comparison of Online and Face-to-Face Delivery Modes.
DEOSNEWS, 11(9). ISSN 1062-9416
Cheng, H. C., Lehman, J. & Armstrong, P. (1991). Comparison of performance and attitude in traditional and computer conferencing classes.
The American Journal of Distance Education 5(3): 5164.
DeNeui, D. L. & Dodge, T. L. (2006) Asynchronous Learning Networks and Student Outcomes: The Utility of Online Learning Components in Hybrid Courses.
Journal of Instructional Psychology, 33(4). 256 - 259.
Lee, J., Carter-Wells, J., Glaeser, B., Ivers, K., & Street, C. (2006). Facilitating the development of a learning community in an online graduate program.
Quarterly Review of Distance Education, 7(1). 13 - 33.
Qing L. & Akins, M. (2005) Sixteen myths about online teaching and learning in higher education: Don't believe everything you hear.
TechTrends: Linking Research & Practice to Improve Learning, 49(4). 51 - 60.
Shachar, M., & Neumann, Y., (2003). Differences Between Traditional and Distance Education Academic Performances: A meta-analytic approach.
International Review of Research in Open and Distance Learning, 4(2).
http://www.irrodl.org/content/v4.2/index.html#mainsection
And organizations devoted to the study of online education:
The Sloan Consortium
http://www.aln.org/index.asp
Penn State
American Center for the Study of Distance Learning
http://www.ed.psu.edu/acsde/deos/deos.asp
[currently being reorganized]
Athabasca University
The International Review of Research in Open & Distance Learning
http://www.irrodl.org/index.html