The main problems with the actual ODE solvers are the followings:

• to describe the problem the user must know the tool language;
• the user must know which method is indicated for his problem if more than one method are implemented in the tool;
• some tools are dependent on other tools and are not portable from one platform to another;
• the user must know how to interpret the results;
• the number of differential equations which can be solved is, in general, limited to a small number.

As a counterexample, we consider a tool in which are implemented only explicit methods and a stiff problem must be solved. In this condition, more probably, no output will be obtained: