Since the founding of IWO, reliability statistics is one of the core subjects. The focus started on characterizing data from breakdown tests and early failures in electrical grids. Issues were the bias and variance of estimated Weibull parameters and how that can influence decision-making. To date, the scope has widened to data analytics for mixed populations, competing failure mechanisms, incomplete data sets, accelerated aging, maintained systems and reparable systems. Digital twinning and evaluation of the similarity between theoretical and observed failure behavior are also studied. Estimation of the number, probability and times of future failures from presently observed failures is the main challenge for the IWO Reliability Statistics department.