Aims: The objective of this study is to evaluate the accuracy of a video imaging program ( Dolphin 11.0 ) in predicting skeletal outcomes in patients with skeletal Class II malocclusion. Methods and Material: The study sample consisted of 5 young adolescents (mean age 11 years) who had undergone functional appliance therapy that included twin block appliance therapy to correct skeletal class II malocclusion. All the patients had lateral cephalograms and profile photographs taken before treatment and after completion of functional therapy. The computer-generated prediction and the actual post functional image was compared and the accuracy of this computer - generated prediction was evaluated. Statistical analysis used: Mean error and Standard deviation. Results: The computer software is showing an error of -1.48 ± 1.33 mm in predicting growth and their is mean error of 5.02 ± 3.18 mm in predicting Lower anterior facial height . The software is under – estimating the mandibular angle. Conclusions: The computer software based predictions were good for patient’s education and communication. Efforts are needed to improve the accuracy of the system for assessment of growth changes following functional appliance therapy.