Modern Statistical Practice make considerable use of the likelihood function. The logarithm of a likelihood function is often more amenable than the likelihood function itself. The likelihood function offers a convenient and informative summary of the numerical information that the data contains about the parameters. With the coming of the high speed computer, it is now possible to undertake the difficult numerical, calculations involved in examining the likelihood function. For a given grouped sample from a truncated normal distribution, log-likelihood contours are plotted here, in order to gain an idea of the shape of the function, and to estimate roughly the parameters.