The Model of PI (image) National Research University Higher School of Economics Share Print E-Mail Caption The influence of formal and informal educational institutions and their connecting link - PI - is shown schematically. Credit IlyaPrakhov et. al. Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.