GPEM is calling for papers for a special issue on Evolvability and Robustness in Artificial Evolving Systems. A diversity of concepts under the rubrics of ‘evolvability’ and ‘robustness’ has been introduced as the literature on these subjects has expanded. This special issue is open to the full range of these concepts.. However, confusion has entered the literature due to imprecise usage of these terms. Therefore, a unique requirement for this special issue will be that the authors provide precise quantitative definitions for the aspects of ‘evolvability’ and ‘robustness’ they investigate.