The goal of this study is to determine whether a computer-based intervention that delivers individually-tailored educational messages about the MMR vaccine increases MMR vaccine-hesitant parents' intentions to have their children vaccinated.

This will be a randomized controlled intervention trial for MMR vaccine-hesitant parents of children ages six years and younger who have not yet received the MMR vaccine. Parents will complete a three-item measure that assesses their baseline intentions for having their children vaccinated with MMR. Participants will then fill out a short, computer-based survey that assesses demographic factors, prior experience with MMR, and views about a variety of potential barriers to MMR vaccination. Following the survey, the intervention group (40 parents) will view a series of tailored educational messages resembling web pages that uses their survey data to address at an individual level their specific concerns about the MMR vaccine. The control group (40 parents) will view a series of generic educational messages resembling web pages that is similar in appearance to the intervention, but contains only untailored information about the vaccine. After navigating through these educational messages, MMR vaccination intention will be reassessed using the same three-item measure as for the baseline assessment of vaccination intention. The vaccine administration records of the children of these parents will be accessed after parents' participation in the study to assess whether the MMR vaccine was provided to the child.

Inclusion Criteria:

• Parent is greater than or equal to 18 years of age
• Parent has a child 6 years of age or younger
• When asked to describe how he/she feels about getting child vaccinated against MMR, parent responds "I don't want to get my child vaccinated" or "I'm unsure if I want my child to get vaccinated"

Exclusion Criteria:

• Cannot read/speak English