Strength for IA is strong research evidence supporting diathesis-stress model. FE Tienari et al conducted study on adopted children who had biological mothers with SZ. They found these children where more likely to develop SZ if raised with dysfunctional family compared to those raised in healthy environments. TMB supports idea that genetic predisposition interacts with environmental factors to trigger SZ. Therefore study provides evidence for IA demonstrating importance of considering both nature and nurture in development of SZ.