Small nucleolar RNAs (snoRNAs) are taken part in processing and base modification (2'-O-ribose methylation and pseudouridylation) in precursor ribosomal RNA (pre-rRNA). In this research, we predict snoRNAs in human genome using computational sequence analysis methods which is named "SOKOS" using stochastic context free grammars (SCFGs). We also develop a Predicted Human Intron database produced from exons predicted by Gene Decoder which is a gene finding technology based on Hidden markov models (HMMs).