The growth in the computer forensic field has created a demand for new software (or increased functionality to existing software) and a means to verify that this software is truly forensic i.e. capable of meeting the requirements of the trier of fact. In this paper, the authors review their previous paper a function oriented testing framework for validation and verification of computer forensic tools. This framework consists of three parts: function mapping, requirements specification and reference set development. Through function mapping, they give a scientific and systemized description of the fundamentals of computer forensic discipline, i.e. what functions are needed in the computer forensic investigation process.