At first glance, IBM Cognos TM1 and Cognos Planning have similar features. They both leverage a multicube architecture and support complex, cross-cube calculations.

The primary differentiating feature of IBM Cognos TM1 can be found in its efficient calculation engine and its method for storing data. When users enter data into most other planning applications, a read/write procedure is performed to reflect the change in a database stored on a hard disk. In contrast, IBM Cognos TM1 calculations and data storage happens in memory/RAM. This allows entered data to be immediately updated within the cube and retrieved. As a result, data is available real-time, which greatly enhances both the performance of queries and ability to perform what-if analytics. Read more