1. A simulator for breast imaging examination comprising: a medical grade computer display; a data input device; and an electronic computer communicating with the medical grade computer display and the data input device, the electronic computer including: (a) an electronic memory system holding a data structure having multiple records linking mammographic images related to actual patients having pre-recall information including a medical history and post-recall information including a final diagnostic conclusion of breast cancer, to expert recall instructions prepared by a healthcare provider reviewing the mammographic images without knowledge of the post-recall information, the expert recall instructions providing a healthcare provider's professional judgment of whether a patient associated with a given mammographic image should be recalled for additional imaging based on the mammographic image but not the post-recall information wherein at least some expert recall instructions are different than recall instructions that would be made based on the final diagnostic conclusion, the electronic memory system further holding a stored program; (b) an electronic processor executing the stored program to successively read the records of the data structure to: (i) display the given mammographic image; (ii) receive input through the data input device indicating a trainee recommended recall instruction providing a trainee's judgment of whether the patient associated with the given mammographic image should be recalled for additional imaging based on the mammographic image; (iii) compare the trainee recommended recall instruction and the expert recall instruction; (iv) repeat steps (i)-(iii) for multiple mammographic images; and (v) output a report indicating divergence between the trainee recommended recall instructions and the expert recall instructions represented by a number of discrepancies between the expert recall instructions and the trainee recall instructions.