The aim of the work presented in this paper is to study the feasibility of a tool, providing aid to the Software Error Effect Analysis (SEEA), based on Case-Based Reasoning (CBR). At present time, our works have allowed, on one hand, the construction of a model for representing SEEA and, using this model, we build a base which collect above 220 SEEA instances. On the other hand, these works result in the design and the implementation of a mock-up. This one, in the process of improvement, shows the feasibility of the study for representing, storing and exploiting the knowledge related to critical-software safety analyses. The perspectives of our works concern the following main points: • improvement and validation of the SEEA representation model, • acquisition of a significant number of instances in order to cover the overall SEEA of any guided transport system, • improvement of the CBR process, particularly the matching and adaptation strategies