This paper focuses on the linguistic achievements gained during a three-week Intensive English Program (IEP) by seven Japanese university students. Even though the length of the study program was only three weeks, there were recognizable improvements in the students' English speaking skills. The students were observed and evaluated in seven areas throughout the three-week program. This contrasts with previous studies that have evaluated student achievement with proficrency tests. Noticeable improvement was specifically made in the areas of amount of speech, fluid speech, asked questions and/or made comments to others, and clear communication.