Abstract
In this paper, I have studied some theoretical aspects of the method for estimating the distribution of buildings life time using age grouped survival and demolished data. In former papers, I and co-authors used a variation of so-called "accumulated hazard method" in the reliability theories. But considering the continuity of the remaining function, I have found that another method, which is similar to the one used in ordinary life time examinations, is also more appropriate in case of making life table or synthesizing age grouped death rate data. This process is computerized and some other programs, like calculating reliable range of the results or estimating the parameters of the remaining function forms, have been developed.
