Jean Frisou and Hélène Yildiz contributed to the evolution of the LSTM model developed by John Tisak and Mary Tisak in 2000. According to their analysis, the LC-LSTM (Latent Curve – Latent State Trait Model) offers an innovative approach by considering the possibility of trait change. Unlike other models, the LC-LSTM addresses this change based on individual trait trajectories, thus emphasizing the permanence of the phenomenon rather than relying on an autoregressive trait factor.