Balance of Homegeneity and Heterogeneity
تعادل یکنواختی و ناهمگونی
The collection of information processing tools (both on the logical and on the physical tool layer) should be as homogeneous (i.e., comparable in appearance and usability, for example, using tools from the same vendor) as possible and as heterogeneous as necessary. In general, a homogeneous set of information processing tools makes training and support of users easier and thus leads to reduced costs for the HIS.