Completion requirements
Check Sheets
Description
Check sheets are used to record the frequency of various events during a particular period.From marking out the occurrence of specific types of problems to counting expected items, this type of data collection can be utilized for nearly anything. Check sheets can be used in conjunction with histograms to visualize the data gathered. A check sheet is a simple way to [6, 18]:
- Collect data
- Convert raw data into helpful information
When to Use
- When data can be observed and collected repeatedly
- When data is collected on the frequency or patterns of events, defects, and so on
- When data is collected from a production process
Procedure
- The objectives of measurement must be defined. These can be done by asking questions like “What is the problem?” “Why should data be collected?” “Who will use the information being collected?” and “Who will collect the data?”
- A proper form for collecting data must be created. The specific things that will be measured must be determined. Then they are written on the left side of the check sheet. The time period must be also determined. Then it is written at the top of the columns.
- The collected data is labeled.
- Each occurrence of the acquired data is recorded on the check sheet.
- The acquired data is tallied.
- The data from the check sheet can then be used in different cases like Pareto chart or a histogram.
Example
According to [40] some of the most Common fabric defects include drop stitches, neps and splicing.
A fabric inspects the quality of the fabric according to these three defects. The record the number of each defect in a check sheet.
According to the procedure, first we define the measurement. A information for the drop stitches, neps and splicing will be collected.
Next we determine the time period - in this example this will be a week.
Now we can construct a table with the fabric defects on the left and the days of the week on the top (Fig. 1.7).
Fig. 1.7 A blank check sheet
Now we record the occurrence of the acquired data on the
check sheet. For example on Monday there are two occurrences of drop stitches, three occurrences of neps and two occurrences of splicing (Fig. 1.8).
Fig. 1.8 A check sheet with record of each occurrence of the defects.
Finally we calculate the total number of occurrence for each defect (14, 16 and 17), for each day (7, 14, 4, 10 and 12) and the total number of all occurred defect during the week (47). The complete check sheet is shown on fig. 1.9.
Fig. 1.9 The complete check sheet