The question of which language to use in introductory programming has been cause for protracted debate, often based on emotive opinions. Several studies on the benefits of individual languages or comparisons between two languages have been conducted, but there is still a lack of objective data used to inform these comparisons. This paper presents a list of criteria based on design decisions used by prominent teaching-language creators. The criteria, once justified, are then used to compare eleven languages which are currently used in introductory programming courses. Recommendations are made on how these criteria can be used or adapted for different situations.