This study investigated a causal model of second language learning. Particular attention was given to three situation‐specific constructs: Language Class Discomfort, Language Class Risktaking, and Language Class Sociability. It was theorized that voluntary Classroom Participation mediates the effect of Language Class Discomfort, Language Class Risktaking, Language Class Sociability, and Strength of Motivation on success in classroom L2 learning. The subjects were students enrolled in first year (first and second quarter) university Spanish classes.Data on Classroom Participation were gathered by means of classroom observation and audio recording. Proficiency was measured by correctness and fluency on a storyretelling task and correctness on a written final examination. The results of the causal analysis included findings that: Language Class Discomfort negatively predicted Language Class Risktaking and Language Class Sociability; Language Class Risktaking positively predicted Classroom Participation; and Classroom Participation positively predicted Oral Correctness for the first quarter student