In the master final work problems of real investments validity assessment are formulated, theoretical methods of assessment of investments efficiency of Lithuanian and foreign authors are analyzed and systemized, advantages and disadvantages of separate methods evaluating real investments are presented, the position of the governmental policy concerning investment issues and legal regulation of this sphere are analyzed. Planned investments of “PAJŪRIO ALKA“ JSC were analyzed using the methods of investment payback period, profitability of the total invested capital and share capital, internal rate of return, net present value and employing their modified forms. The analysis of methods confirms the author’s formulated hypothesis of the scientific research that not separate assessed indicators influence decisions made in the company concerning investments validity, but consistency of calculated indicators and their reciprocity. Furthermore, the model of assessment of investment projects inside the company based upon consistency of coordination of the main financial efficiency assessment indicators is proposed.