Perform Quality Assurance: Outputs

.6 Run Chart A run chart shows the history and pattern of variation. A run chart is a line graph that shows data points plotted in the order in which they occur. Run charts show trends in a process over time, variation over time, or declines or improvements in a process over time. Trend analysis is performed using run charts. Trend analysis involves using mathematical techniques to forecast future outcomes based on historical results. Trend analysis is often used to monitor: • Technical performance. How many errors or defects have been identified, how many remain uncorrected? • Cost and schedule performance. How many activities per period were completed with significant variances? .7 Scatter Diagram A scatter diagram shows the pattern of relationship between two variables. This tool allows the quality team to study and identify the possible relationship between changes observed in two variables. Dependent variables versus independent variables are plotted. The closer the points are to a diagonal line, the more closely they are related. .8 Statistical Sampling Statistical sampling involves choosing part of a population of interest for inspection for example, selecting ten engineering drawings at random from a list of seventy- five. Appropriate sampling can often reduce the cost of quality control. There is a substantial body of knowledge on statistical sampling; in some application areas, it may be necessary for the project management team to be familiar with a variety of sampling techniques. .9 Inspection An inspection is the examination of a work product to determine whether it conforms to standards. Generally, the results of an inspection include measurements. Inspections can be conducted at any level. For example, the results of a single activity can be inspected, or the final product of the project can be inspected. Inspections are also called reviews, peer reviews, audits, and walkthroughs. In some application areas, these terms have narrow and specific meanings. Inspections are also used to validate defect repairs. .10 Defect Repair Review Defect repair review is an action taken by the quality control department or similarly titled organization to ensure that product defects are repaired and brought into compliance with requirements or specifications. A Guide to the Project Management Body of Knowledge PMBOK ® Guide Third Edition 196 2004 Project Management Institute, Four Campus Boulevard, Newtown Square, PA 19073-3299 USA