Bringing Help to the Forefront: Strategies to Increase the Usability of Your Software User Assistance and Your Product
http://www.stc.org/intercom/PDFs/2009/200906_16-20.pdf
  access restricted (by the publisher) to members/subscribers/customers only

Bleiel, Nicoletta A.
Intercom
2009

Abstract:

Makes the case for embedded help as one of the most effective ways to integrate help within an interface. Although it can be difficult, Bleiel illustrates a way to “elegantly implement and map embedded help.”