Students will develop understanding of quality assurance in industry, which includes working with upper and lower control limits for product length. They will exercise skill in rounding, measuring, finding means, looking for patterns, and collecting data, as well as representing and interpreting data through the use of coordinate graphing. You might wish to spend more time on prerequisite skills than is included in this unit.

It is important to include the teacher's parts of this unit in teaching it, and it is suggested that students work in small groups for most or all of the activities. In some cases answer keys provide sample answers-other reasonable answers should be considered. Individual activities are not intended to be accomplished in one class period. Each may take up to several class periods to complete. Key objectives addressed the previous day or two should be reviewed in some manner at the beginning of each class period.

This unit involves finding the length of wire coils but can be adapted for use with other manufactured items. An attribute other than length (e.g., weight) might replace or be added to the attribute under investigation. Local industries may be helpful in determining such details.