I'm hoping for a little guidance on how to model data in the following design. I'm interested in estimating the effect of gender, social context (individual vs group of 3 people), and their interaction on 2 latent variables (male attractiveness & female attractiveness) with 5 indicators each. A colleague suggested using a multilevel design because scores on the 5 indicators are not independent in the group condition. I'm having trouble conceptualizing how to do this with an interaction effect. Are there any examples in the user guide that would be particularly useful for this design?