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Abstract-In a word, yes. The study determined the relationship between class attendance and mastery of a second language. Instructors kept detailed records of both attendance and classroom-discussed material. In a content-based class, the in-class material exam questions were isolated and the results showed that missing a single class increased the student's likelihood of an incorrect answer by three times compared to a student who attended class when the material was discussed. In a skills-based class, where in-class and outside-class material could not be separated, missing a single class increased a student's likelihood of an incorrect answer seven to eight times that of a student who attended class. Therefore missing classes does significantly affect test performance as well as mastery of the target language and content. These results lead to a number of significant conclusions which have implications for teaching in general, teaching a foreign language teaching in particular, educational policy, the link between class attendance and mastery of course content, and how best to measure the level of that mastery.

A simple force constant model is described which allows the zone-center normal mode frequencies of potassium cyanide and sodium cyanide in their ordered anti-ferroelectric phase to be calculated. The degree of translational-librational coupling is deduced from the eigenvectors, and relative Raman and infrared intensities are estimated. Results are compared with available experimental data, and good agreement is obtained for KCN. The simple model is, however, unable to fully explain the observed Raman intensity distribution in NaCN, and possible additional contributing mechanisms are briefly discussed.Ein einfaches Kraftkonstantenmodell wird beschrieben, das erlaubt, die Frequenzen der Zonenzentrennormalmode von Kaliumzyanid und Natriumzyanid in der geordneten antiferroelektrischen Phase zu berechnen. Der Grad der Translations-Librations-Kopplung wird aus den Eigenvektoren bestimmt, und die relativen Raman-und Infrarot-Intensititen werden berechnet. Die Ergebnisse werden mit verfiigbaren experimentellen Werten verglichen, und es wird fur KCN gute Ubereinstimmung erhalten. Das einfache Model1 kann jedoch nicht die beobachtete Raman-Intensitatsverteilung in NaCN erklaren, und mogliche zusatzlich beitragende Mechanismen werden kurz diskutiert.