Modern Stellar Evolution Models for Low Mass Stars
  The status of the art for evolutionary models of low mass, population II stars is revisited, stressing the need for the models to be preliminarily tested with suitable observational data. The uncertainties still affecting the theory are discussed in the aim of guiding the users in a reasoned choice of the models. The powerful coupling of evolutionary with pulsational theories is shortly recalled. A short conclusion and a mention of the problem of tilted HB close the paper. 
V. Castellani (INAF, Osservatorio Astronomico di Roma, Italy)