The model in Cognos Planning is build by using D-lists, D-Cubes.
What is a D-List?
It is a list of related items. Technically D-list is a one dimensional array. For example List of countries can be a D-List. By using D-Lists we create D-Cubes.
What is a D-Cube?
It is a multi dimensional array. For example...
Lets say a company want to analyse its products' sales in different countries from January to December. So we will have to create 3 D-Lists
1. Products- It will contain items like Keyboard, Mouse, Monitor (if company is of PC products)
2. Countries- It will contain list of countries like US, UK, Germany, Japan etc.
3. Time- It will have items from Jan to Dec.
Apart from the items necessary, we also include the items which help us doing aggregation. Countries can be aggregated to Continents, Time items can be aggregated to Quarters and Year.
The values
Values of normal items - can be taken from other D-List items, some formulae or can be entered as constant. We can also specify the format of the values.
Values of aggregated items - These values are generally calculated from the other items by applying formulae for example addition of items or percent (%), deviation etc.
What is an E-List?
E-List is a hierarchical D-List. A D-List with defined hierarchy. It contains tree like structure with parent and child nodes.