THE IDENTIFICATION OF THE OPTIMAL COMBINATION OF STIMULI AND THEIR TIMING FOR LARGE INCREASES IN RECOGNITION VOCABULARY IN A FOREIGN LANGUAGE AFTER STUDENTS HAVE MASTERED THE BASIC STRUCTURE OF THE LANGUAGE WAS THE SUBJECT OF RESEARCH UNDERTAKEN WITH STUDENTS ENROLLED AT THE GEORGETOWN UNIVERSITY SCHOOL OF LANGUAGES AND LINGUISTICS. FOLLOWING A SURVEY OF THE PROBLEM, OBJECTIVES, AND RELATED RESEARCH, THE REPORT DISCUSSES THE GENERAL METHODS FOLLOWED IN NINE EXPERIMENTS. THE REPORT CONSIDERS IN DETAIL THE SPECIFIC PROCEDURES, ANALYSES, AND FINDINGS FOR EACH EXPERIMENT AND SUPPORTS EACH WITH A TABLE OF STATISTICAL FINDINGS. THE WHOLE EXPERIMENTAL SERIES DEALT CUMULATIVELY WITH THREE COMPLEX VARIABLES--EXPRESSION, DENOTATION, AND CONTEXT--PLUS ORDER AND MODES OF PRESENTATION OF THEIR ELEMENTS, E.G., (1) LISTENING VS. READING, (2) NATIVE LANGUAGE VS. TARGET LANGUAGE READING VS. LISTENING, AND (3) PICTURE, SENTENCE, AND OTHER CONTEXTUAL CLUES. ANALYSES OF THE FINDINGS INCLUDE SEVEN GENERAL CONCLUSIONS, IMPLICATIONS FOR VOCABULARY EXPANSION AND LEARNING RESEARCH, RECOMMENDATIONS, A SUMMARY OF THE RESEARCH, AND A LIST OF REFERENCES. IN THE EXTENSIVE APPENDIXES ARE (1) LISTS OF SYMBOLS, (2) VOCABULARY ITEMS, (3) INSTRUCTIONS, ADMINISTRATIVE FORMAT, AND TESTING MATERIALS FOR EACH EXPERIMENT, (4) QUESTIONNAIRES BASED ON APTITUDE, ATTITUDE, AND DEBRIEFING, AND (5) A GENERAL BIBLIOGRAPHY. (AB)