Check Sheet

Check Sheets are use to collect  data about processes. The data collected by check sheets can be used to create Pareto Charts, Histogram, etc.

Initially there is four types of check sheets. But in some special  cases we can customize any type of check sheet and also can create new check sheet to collect data what we need. If you collect data for some kind of project best thing is collect data yourself or in your supervision. Don't use any data collected by somebody else in past. otherwise you can't get clear idea about the situation.

The four types of Check Sheets are here.

1.Classification of Defects

Using this type we can collect data about no of defects & types of them.

Example:-

Below chart shows that use of this type of check sheet in wood working factory.

2.Identify Defected Location

Use of this type of check sheets is to identify the relation between the defect and the place it appear on the finished product. We can use picture of finish product as a check sheet. 
Example:-
Let us take we need to identify defective locations of Floor Tiles after the kilning process. Below picture shows that the defected location of a lot of tiles.

3.Identify Frequency of Defect.

This type of check sheets are little bit complex than previous types. There is more data in this check sheet and we can us this to collect large amount of data (time, operator, machine) about defects.

Example:-

Below check sheet shows that the data collected by tyre making factory. Morning means 8.00am to 12.00noon & Evening  means 12.00pm to 4.00pm.

4.Check List.

This type of check sheets are used to check whether all operations are completed or not. Here we have list of operations to be done & after each operation the relevant column should mark by operator. 
Example:-
Below check sheet shows that usage of this type in a wood working factory.

Scatter Diagram

Scatter diagrams are used to find a relation between two parameters. Here we need change the one parameter & get readings for other parameters.

Example:-

Let us take we need to find the relation between machine speed & filled volume of water for a water bottling machine. Here changing parameter is speed. 

Step  01   :- Set machine speed 10bottles/min

Step 02 :- Take few samples from output & measure the volume

Step 03   :- Increase machine speed by 2 bottles/min

Step 04   :- Take few samples from output measure the volume

Step 05   :- Do step 03 & 04 till as you required.

Then plot a graph using collected data. Based on that chart it is easy to identify relationship between machine speed & filled volume. 

There is 3 major types of Scatter Diagrams.

1.Positive Scatter Diagrams

Here we can find clear relation between two factors. It shows that increasing of the bottles/min  effected to increase the filled volume of the bottle.

2.Negative Scatter Diagrams

Like as above here increasing of the speed decreased the filled volume.

3.Scatter Diagrams Which Haven't any Relation

Here we cant find any relation between two factors.

7 Quality Tools

There is many tools for analyse an incident (problem). But in terms of Quality we can get 7 tools out from there and called them as Seven Quality Tools. 

1. Check Sheet
2.  Histogram
3.  Pareto Charts
4.  Scatter Diagram
5.  Cause and Effect Diagram
6.  Flow Charts
7.  Control Charts

These tools are commonly use around the world to analyse data collected by various types projects.(5S projects, KI - ZAN projects and also in Quality Circles) hereafter i will take one by one and briefly explain in future posts.