The development of ISM was made by Warfield in 1974.
ISM is the process of collaborating distinct or related essentials into a simplified and an organized format. Hence, ISM is a methodology that seeks the interrelationships among the various elements considered and endows with a hierarchical and multilevel structure.
To run this package user needs to provide a matrix (VAXO) converted into 0's and 1's.
Warfield,J.N. (1974)