stochast = struct(...
    'Name', {
    'R'... % example stochastic variable "R" (resistance or strength)
    'S'... % example stochastic variable "S" (sollicitation or load)
    },...
    'Distr', {
    @norm_inv... % distribution function (of R)
    @norm_inv... % distribution function (of S)
    },...
    'Params', {
    {9 2}... % parameters mu and sigma of normal distribution (of R)
    {6 3}... % parameters mu and sigma of normal distribution (of S)
    },...
    'propertyName', {
    true... % add propertyname of (of R) in z-function call
    true... % add propertyname of (of S) in z-function call
    } ...
    );