The discussion will concern:  
- 
        baseline parameter definition at 1 GeV (and maybe 5 GeV);
- 
        identification of a suitable plasma regime (linear, non-linear etc) and plasma target;
- 
        discuss driver and witness pulse shaping, if required;
- 
        beam/plasma matching conditions and scaling laws;
- 
        energy spread compensation, if required ;
- 
        required diagnostics tools;
- 
        start-to-end simulations;
- 
        test experiments at FLASHForward or SPARC.
