I hereby declare that this submission is my own work and to the best of my knowledge it contains no materials previously published or written by another person, nor material which to a substantial extent has been accepted for the award of any other degree or diploma at UNSW or any other educational institution, except where due acknowledgement is made in the thesis. Any contribution made to the research by others, with whom 1 have worked at UNSW or elsewhere, is explicitly acknowledged in the thesis. I also declare that the intellectual content of this thesis is the product of my own work, except to the extent that assistance from others in the project's design and conception or in style, presentation and linguistic expression is acknowledged. (Signed) (i) I would like to express my sincere thanks and gratitude to my supervisor and mentor, Professor John Sweller for his continued support, guidance, patience, encouragement and invaluable feedback and suggestions during the course of conducting my research and writing up my thesis. I would also like to thank my co-supervisor, Professor Martin Cooper for his encouragement, guidance and feedback in helping me conduct my research, as well as Dr. Paul Chandler for his suggestions, guidance and support while receiving a scholarship.

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