**3.3 Determination of variables affecting performance characteristics**

Independent variables that affect the product performance characteristics should be determined. Previous experience and expertise are very important in this determination. Brainstorming, cause-effect diagrams and flowcharts are important tools to be used. Easily controllable independent variables are put in the group of control variables (CV) and the others into the group of uncontrollable variables (UCV).

## **3.4 Establishing the screening design**

If the number of CV is large, it may not be possible to carry out the experiment in terms of time and cost. In such a case, there may be some variables that are believed to have no effect at the outset. Of course, making such a choice is difficult. Even after some variables are discarded, there is still the question of whether other variables are important. Screening design allows to get more realistic results with predetermined variables. In the sifter design, the level number is kept as low as possible, usually taken as two. The outputs are analyzed and junk CV is discarded. Significant CV is included in the main experimental group.

5. Identifying controllable and uncontrollable variables and their levels

8.Determination of loss function and performance statistics

**3.1 Determining the problem and organizing the experiment team**

the work to be done. If an existing product is to be developed, "why was this product chosen?" The question must be answered. Generally as an answer to this question; scrap, rework, warranty and service costs can be given. After the problem is determined, the team that will do the task should be formed. The team generally; It consists of experts of the problem of interest, DOE experts, senior management representative and people who will conduct the experiment. The other steps we try

**3.2 Determination of performance characteristics and measurement system**

**3.3 Determination of variables affecting performance characteristics**

Independent variables that affect the product performance characteristics should be determined. Previous experience and expertise are very important in this determination. Brainstorming, cause-effect diagrams and flowcharts are important tools to be used. Easily controllable independent variables are put in the group of control variables (CV) and the others into the group of uncontrollable variables

If the number of CV is large, it may not be possible to carry out the experiment

in terms of time and cost. In such a case, there may be some variables that are believed to have no effect at the outset. Of course, making such a choice is difficult. Even after some variables are discarded, there is still the question of whether other variables are important. Screening design allows to get more realistic results with predetermined variables. In the sifter design, the level number is kept as low as possible, usually taken as two. The outputs are analyzed and junk CV is discarded.

Significant CV is included in the main experimental group.

The product may have one or more performance characteristics, so the selection of performance characteristics is important. The important point here is that the customer's view should not go unnoticed. Performance characteristics are the basis of the study. Determining the measuring system is the second step in this phase. Each of the performance characteristics may require different measuring systems.

9.Establishing the experiment and recording the results

*Quality Control - Intelligent Manufacturing, Robust Design and Charts*

7.Selection of suitable orthogonal array and assignment of variables to relevant

10.Analysis of data and selection of optimum value of controllable variables

When a new product is to be developed, there is no need for any examination for

6. Identification of possible interactions

to explain below are carried out by this team.

**3.4 Establishing the screening design**

columns

(UCV).

**116**
