An instructor's manual and student activity guide on the cotton boll are provided in this set of prevocational education materials which focuses on the vocational area of trade and industry (textiles). (This set of materials is one of ninety-two prevocational education sets arranged around a cluster of seven vocational offerings: agriculture, home economics, distributive education, health occupations, world of work, trade and industry, and office occupations.) The instructor's guide is organized into the following elements: title of activity, duration of activity (two to eight periods), activity goals, five instructional objectives, related vocational clusters, and activity implementation (description, materials needed, safety considerations, teacher preparation prior to class, during the class, follow-up activities, and a student question sheet to be duplicated). The student activity guide provides step-by-step instructions (narrative and illustrations) for completing each instructional objective (e.g., pick the reed and chaff from the cotton boll, twist the strands of fiber into one long strand). At the end of each set of instructions is a student check point (evaluation activity). Fourteen occupational descriptions (e.g., card tender, skein winder, weaver, knitting machine operator) conclude the document. (JH)