| augment_levels | Augment levels and B-matrix to Full Factorial Design. | 
| check_overshadow | Check Overshadow - Pareto Dominate Solutions | 
| construct_question_frame | Convert from choice_sets to a question data | 
| dce_efficiency | Efficiency Measures for Discrete Choice Experiments | 
| fractional_factorial_efficiency | Fractional Factorial Design Efficiency | 
| full_factorial | Full Factorial Design | 
| modulo_method | Modulo Method - Described by Street et al. | 
| search_design | Search Full Factorial for Fractional Factorial Design |