THE AUTHORS ARE grateful to the following individuals who read through drafts of the manuscript and offered invaluable advice for improvement:

We also thank two individuals who have greatly contributed to this book. Matt Davis, our acquisition editor, understood the importance of cognitive load theory to recommend acceptance of our book proposal. Leslie Stephen, our developmental editor, gave us invaluable suggestions for improving the organization and readability of the first draft.

We are also grateful to Barry Galloway, who provided the narration on our CD demonstrations, and Global Knowledge, who provided examples of their electronic performance support systems.