The 7 basic tools of quality

  1. Stratification:

Stratification analysis is a quality assurance tool used to sort data, object, and people into separate and distinct group.

2. Histogram:

quality professional are often tasked with analyzing and interpreting the behavior of different group of data in an effort to manage quality.

this is where quality control tools like the histogram come into play.

3. Check sheet:

check sheets can be used to collect quantitative or qualitative data. When used to collect quantitative data, they can be called a tally sheet.

4 cause-and-effect diagram:

Introduced by karoru Ishikawa, the fishbone diagram helps users identify the various factors leading to an effect, usually depicted as a problem to be solved.

5 Pareto chart:

As a quality control tool, the Pareto chart operates accounting to the 80-20rule.

This rule assume that in any process, 80% of a process’s or system’ s problem ate caused by 20% of major factor, often referred to as the ” Vital few”.

6. Scatter diagram:

out of the seven quality tools, the scatter diagram is most useful in depicting the relationship between two variable which is ideal for quality assurance professional Trying to identify cause and effect relationship.

7. Control charts:

The control chart is a graph used to study how a central a process change over time,. Data are plotted on time.

A control chart always has a central line for the average charts, an upper line for the upper control limit, and lower line for the lower control limit. Control chart for variable data are used in pairs.