Quantitative evaluation of horticulture vocational-therapy programs is becoming more and more critical as professionals in the area of people-plant interactions try to document the value of their programs. Evaluation tools to assess self-development of individuals studying such factors as self-esteem, life satisfaction, and locus of control have long been used in the social science disciplines. Many of these tools, either in their original forms or with some adaptations, can be successfully used to measure changes in self-development of individuals participating in horticulture programs.