One of the distinct trends in modern cosmology is in testing its theoretical aspects against the high precision data available in recent years. Although the standard cosmological model has already shown certain satisfactory results in matching the data from observations of the Cosmic Microwave Background and Large Scale Structure, we are by far unable to be convinced of its ability in describing the complete nature of the universe. Therefore, detailed study has to be done in the theory of higher order cosmological perturbation to enable us the ability in describing the non-linear aspects of the universe.

Includes bibliographical references (p. 112-122).

Includes abstract.