… Based on done calculations were identified some properties of indices, including: the
character of dependences on initial data; the relation larger/smaller between percentages of
each of the pairs {NP, NPE}, {NR, NRE} and {PR, PRE} (for example, the use of EANPV and
EAPI indices to compare projects with unequal lives not only allows a more accurate estimation
of projects efficiency, but also the solutions obtained may differ more frequently than when using
the NPV and PI indices); the overall size of the value range and maximum average percentage …

Theoretical results not always give an unambiguous answer regarding the preference of
using the indices of efficiency of investment in IT projects with equal lives. To complement
some of such results, the Net Present Value (NPV), Profitability (PI) and Internal Rate of
Return (IRR) indices are researched by computer simulation. In this aim, a model of
comparative analysis of projects with equal lives is defined and the SIMINV application is
made up. Using SIMINV, the percentage of cases when the solutions, obtained according to …