The present paper is a preliminary progress report of a DOE program at Terra Tek, Inc. to develop a wireline tool for in situ stress measurements by hydraulic fracturing. In addition, a laboratory and analytical study are underway to determine the feasibility of in situ stress measurement through the casing (via perforation). This program could fill the gap that currently exists in the commercial application of in situ stress determination as a design tool for MHF stimulation of tight formations. The paper will be split in two parts. The first part discusses the aspects of the wireline tool, while the second part deals with the measurements of in situ stress through casing perforations.