# Matrix Diagram in Product Quality Identification

Written by: Aidah Khansa Fahniar (SRK 2020)

Matrix Diagram (MD) is a tool consisting of columns and rows that provides an overview of the relationship between 2 or more factors to assess the strength of the relationship and or the relationship of these factors. The factors that are connected in the matrix diagram itself must have similarities to produce a conclusion. There are several types of matrix diagrams, as listed below.

1. L-type

A Matrix diagram with L-type is a diagram matrix that is useful for connecting 2 groups

1. T-type

A Matrix diagram with a T-type is a matrix diagram that is useful for connecting 2 groups with 1 other group.

1. Y-type

A Matrix diagram with Y-type is a matrix diagram that is useful for connecting 3 groups, and between these groups, they have their respective relationships.

1. X-type

A Matrix diagram with X-type is a matrix diagram that is useful for connecting 4 groups, where each group has its relationship with 2 other groups

1. C-type

A Matrix diagram with C-type is a 3-dimensional matrix diagram and is useful for connecting 3 groups

1. QFD Type (Quality Function Deployment)

QFD is a derivative of the L matrix diagram which is modified with an additional list connected to the main list. The use of QFD itself is to find a relationship between several factors that must be developed in a new product (system introduction), with the identification of this relationship can provide information regarding what things need to be reviewed or are appropriate so that the quality of a new product or system can increase.

On the other hand, the stages of making a matrix diagram (MD) are as follows.

1. Setting goals

Before making a matrix diagram, it is necessary to determine what goals or problems will be solved with this matrix diagram.

1. Identifying the group of factors to be linked

At this stage, identification is carried out regarding what data will be connected, and the identification of the data has met the requirements to be connected.

The Selection of a competent team is highly recommended at this stage.

1. Determine the appropriate form of the matrix

At this stage, it is possible to determine the type of matrix form that is under the problems that have been determined previously

1. Define relationship symbol

The symbol of the relationship must be determined before connecting the group of factors on the matrix diagram. The following are some examples of symbols commonly used in matrix diagrams

1. Discuss the identification of matrix relationships

This stage is the core stage of all stages of making matrix diagrams. Discussions were held with the team regarding the relationship of one factor to another and to identify which factors had a strong, moderate, or weak relationship.

1. Conclusion

At this stage, conclusions are drawn from discussions and the identification of relationships that have been carried out previously. This is done so that other people’s understanding of the matrix diagram that has been made can be easier when it will be used as a reference in the future.

The use of this matrix diagram can be useful for identifying the quality of a product. The type of matrix diagram that is often used to identify product quality is QFD. In the first iteration of QFD, the relationship between the customer requirements of the product and the technical characteristics needed to meet customer requirements are examined.

From the matrix relationships that have been identified with the team, conclusions will be drawn regarding what developments are needed or appropriate. Therefore, QFD can be used as a new approach to the quality assurance of a product.

Sources:

Burj, Stuart. (2006). The System Engineering Tool Box. Burge Hughes Walsh. The United Kingdom.

Franceschini, Fiorenzo. (2002). Advanced Quality Function Deployment. CRC Press. Florida