Table 1. Key PEI constructs identified in prior work and example intervention messages.

Construct	Example findings from previous qualitative work [14, 15]	Examples of intervention messages
Perceived susceptibility	All breast cancer patients received referral for genetic counseling (i.e., the patients felt that there was nothing “unique” about their diagnosis that triggered the genetic counseling referral)	Heading: Why was I referred for genetic counseling?
		Sample text: “You are most likely to benefit from genetic counseling if: you were diagnosed with breast cancer before age 50, had a previous breast cancer diagnosis…”
Perceived benefits	Women who attended genetic counseling were pleasantly surprised by many aspects of the genetic counseling process	Heading: One patient's story
		Sample text: “Genetic counseling helped Sue understand why she developed breast cancer and also helped her weigh the options related to future risk reduction.” (part of patient testimonial)
Perceived barriers	Concerns about the cost of testing	Heading: Does my insurance cover the cost of genetic testing?
		Sample text: “Many insurance companies cover the cost of testing for people who have a personal or family history of cancer…the out of pocket cost of testing is usually less than $400. …Even if you do not have insurance, your health care provider may be aware of other options for coverage.”
Cues to action	Physician recommendation is an important way to prime women to consider genetic counseling	Heading: Introduction
		Sample text: “Only about 10–15 % of all women diagnosed with breast cancer are referred for genetic counseling.”
Knowledge	Lack of awareness about genetic counseling and genetic testing process	Heading: What is genetic counseling?
		Sample text: “By the end of the session, you will likely have enough information to consider whether or not you want to proceed with genetic testing…”
Implementation intentions	Women who recalled receiving a referral letter intended to have genetic counseling at some point in the future	Heading: How can I make an appointment for genetic counseling?
		Sample text: “Call XXX to schedule an appointment.”
		Provided space to fill in appointment date, time, and important documents to bring to session
Distress	Women felt that having genetic counseling during the diagnosis and treatment process would be overwhelming	Heading: I still have many emotions and feelings…I am not sure if I am ready to have genetic counseling