EyeQuestion provides a diverse range of design types to meet your every need. On the "Design Type" tab within the Design Generator, you can select from various design options. This page offers an overview of each design type available.

One of the most used designs is the completely balanced design or Williams design. Select the design type balanced and the number of products. Each sample set contains the requested amount of products. Products are presented one at a time (not multi product).

Design that has an equal number of observations but not all treatments can be assigned to each block, set or session. A balanced incomplete design can be used to create a design that contains more products than product presentations. For example you have 5 products but only want to present 3 products to each panellist. Always specify a number of treatments that is less then the number of products.

Design that contains blocks of three samples which are a combination of two products where two are identical and one is different. This design is suitable for a Triangle test. The number of products is automatically specified to 2. The number of sets needs to be a plural of 6 since there are 6 possible combinations. When you specify the number of sets to a number that is not a plural of 6 EyeQuestion will automatically adjust the number.

You can use the Triangle RANDOM when you include multiple products in your design and you want to randomize the order. For instance, you created a design that had 4 products. Some panelists will begin by comparing product 1 to product 2, while others will begin by comparing product 3 to product 4. The sequence is random.

Design that contains two products and the replicate of each product that are presented at the same time. This design is suitable for a Tetrad test. The number of products is automatically specified to 4.

You can use the Tetrad RANDOM when you include multiple products in your design and you want to randomize the order. For instance, you created a design that had 4 products. Some panelists will begin by comparing product 1 to product 2, while others will begin by comparing product 3 to product 4. The sequence is random.

Design that contains a reference product, an additional identical reference product and a second product that is different from the reference. The reference product differs between the sets. This design is suitable for a Duo Trio Balanced Reference test. The number of products is automatically specified to 2. Each sample set contains a block (B1) with three samples. Each block contains two equal products and one odd product. One of the two equal products is the Reference sample. The reference sample is balanced throughout the design. Product 1 and product 2 occur equally as reference sample.

Design that contains a reference product, an additional identical reference product and a second product that is different from the reference. The reference product is always the same product. This design is suitable for a Duo Trio Constant Reference test. The number of products is automatically specified to 2. Each sample set contains a block (B1) with three samples. Each block contains two equal products and one odd product. One of the two equal products is the Reference sample. The reference sample is equal in each sample set.

Design that does not contain a reference product but only contains the products to be tested. This design is suitable for an A/ not A test. The number of products is automatically specified to 2. Each sample set contains one sample. The samples are equally distributed across the sample set.

Design that contains products that are paired together and always presented together in pairs. A product is always paired with the same product. This design is suitable for a Paired Comparison test. Select the design type Paired Comparison. The number of products is automatically specified to 2. Each sample set contains a block (B1) with two samples. Each block contains two different products. The samples are distributed equally across the design.

Design that contains products that are paired together and always presented together in pairs. All possible combination of pairs are included in the design. The Paired comparison full design is a variation on the Paired comparison design. This design can be used if you want to compare more then 2 products. Specify the number of products to a number above 2.

Design that has a balanced design within each block. This option can be used to create a balanced design with a pattern. When generating this type of design you must always insert a block pattern. For example, when using the pattern "1,4,1,4", the design generator will create the 40 sample sets each containing 10 products. Product 1 is the same in each sample set, the next 4 products (2-5) are balanced throughout each sample set, the following product (6) is the same in each sample set and the next 4 products (7-10) are balanced throughout the sample sets.

Design that has a balanced design within each block. This option can be used to create a balanced design with a pattern. When generating this type of design you must always insert a block pattern. For example, when using the pattern "1,4,1,4", the design generator will create the 40 sample sets each containing 10 products. Different from the Balanced Blocks design, the products will be placed randomly in each block.

Design that does not have to have an equal number of observations for all possible combinations of factor levels

Design that contains two products and a reference product. The reference product is always the same product. The amount of samples is fixed and set up to be presented in a block.

Design that will generate a fixed order for all sets. Every set will have the same amount of products in the same order.

If your preferred design can not be created using the design generator, a custom design can be created using excel and imported in an EyeQuestion project. Read more about this functionality in the following article: https://support.eyequestion.nl/portal/en/kb/articles/how-can-i-import-a-custom-design

# Related Articles

## Paired Comparison

Introduction The paired comparison method is a handy method to use when dealing with products that have a lasting effect or are in short supply. Unlike other tests like the triangle or duo-trio, it works well when showing three samples at once isn't ...## Workspace: Design Page

Introduction Welcome to the Design section of EyeQuestion, where the structure of your questionnaire takes shape. This crucial page is where you determine the order in which panelists will evaluate the products. Each template provided within this ...## How Do I Generate an Experimental Design

In EyeQuestion you can generate different kind of experimental design. Some experimental designs are already included in the application, while specific ones can be imported. In the following article you will find more information on this kind of ...## How to Build a Balanced Incomplete Design with More than 17 Products

The Balanced Incomplete Design is a design that has an equal number of observations but not all treatments can be assigned to each block, set or session. This can be used to create a design that contains more products than product presentations. For ...## Question Types Available in EyeQuestion

In EyeQuestion you have two libraries of question types available. Your own custom template library and the default system template library. The default library contains a wide range of question types and are divided into several subfolders. Question ...