在部份因子設計的領域中，『半折疊設計』(semifolding design)的觀念與技巧在解析度IV的設計裡已有詳盡的介紹與探討，但在解析度III的設計中，到目前為止，卻尚未有詳盡的探討，所以本篇論文主要是針對16-run及32-run解析度III的設計，利用John (2000) 和Li and Mee (2000) 所提的概念與作法，進行半折疊。本論文所建議之半折疊過程為先將原始設計分成二集區，然後再對其中一集區進行折疊。文中將表列最佳分集區的因子組合，並將應用實例與在四種不同的考量下，來對半折疊設計與全折疊設計做一比較。 / In the area of the fractional factorial design, the concepts and techniques of semifolding have been developed for resolution IV designs, but they are not yet done for resolution III designs. This paper, however, focuses on 16-run and 32-run resolution III designs. We apply the concepts and techniques of semifolding in John (2000) and Li and Mee (2000) to resolution III designs as they have established for resolution IV designs. The procedure we suggest in doing semifolding in this paper is to block the original design into two sections, and then fold over one section. The “optimal” blocking factors are listed in tables, and the performance of semifolding designs in comparison with that of foldover designs are shown by means of examples.