Prohibited Concepts allow you to make the Concepts (Attributes and Levels) more realistic. It allows for definiting "Rules" that the Conjoint Module wil l follow when deciding on what Attributes and Levels to make up a Concept. You can create as many "Pairs" as you want and the Engine will never display those levels that have been marked as "Prohibited" in the same concept (as a product) for the user to choose. You can also directly prohibit a concept by providing the levels of that concept.
The Prohibited Concepts tool can be accessed at :
To remove an "Existing Prohibited Concepts, simply change the Drop Down Combo-Box to "Select", and then Save your changes. This will automatically remove that Prohibited Concepts.
It is very important that you simulate (Using the Concept Simulator) after defining your Prohibited Concepts. It is entirely possible that the combination of the Prohibited Concepts that you have defined leave fewer alternatives than the number of "Concepts Per Task" -- In such a case the engine will error out and the user will not be able to complete the survey. Please simulate at least 1000 respondents (Using the Concept Simulator) to make sure that your design is orthogonal enough. In order to avoid this, please only use the bare minimum prohibited pairs, to achieve maximum orthogonal design. Remember, the idea behind Conjoint is to "discover" trade offs.
This feature is available with the following license :