In this study three commonly used computer programs for influence diagram evaluation are compared: Netica, Hugin Expert and PrecisionTree. The programs are analysed with respect to three main issues: how they comply with semantic rules for influence diagrams, how the issue of asymmetric decision problems is handled in each tool, and if and in what way they implement the arc reversal functionality. The results show that i) none of the tools fully complies with the semantic rules for influence diagrams, ii) the tools based on Bayesian nets (Netica, Hugin Expert) handle asymmetric decision problems in a similar way, whereas PrecisionTree implements a unique, efficient way of handling the issue, and iii) two of the three tools, Netica and Hugin Expert,support arc reversal.