Table 2.

Development stages for Risk Estimation for Additional Cancer Testing (REACT).

Time	Development and changes to the REACT website
May 1st to June 26th 2017	Development of the initial version of the REACT website
July 7th to August 21st 2017	Simplifying the website (eg, giving immediate access to the questionnaire, changing disclaimer to a single click pop up) Change of website theme color from green to orange Removal of any animations included on the website Addition of realistic images with people Adding carousel to the website (including user testimonies, REACT description) Cancer questionnaire iterations Cancer risk presentation iterations
August 23rd to October 2nd 2017	Addition of multiple cancers Enabling printout for users pointing to the cancerous symptoms Addition of the REFLECT model Cancer questionnaire iterations Cancer risk presentation iterations (mainly added “waffle chart” visual for representation of 100 people representing population risk) Positive framing in relation to early cancer detection (mainly in the carousel on the landing page of the website)
October 5th to November 30th 2017	Cancer questionnaire iterations (emphasizing that the questions relate to “not normal to you” symptoms Cancer risk presentation iterations (using both affected and population risk presentation)