A novel procedure for generating connectivity topological descriptors,
denoted SP (subgraph property), is proposed according to the enumerat
ive procedure of Wiener. It is exemplified for P being the number of v
ertices in graph N, walk degree W-e, Randic index chi and Balaban inde
x J. SP indices are tested about the correlation with some physico-che
mical properties of octane isomers.