stratification (n.)

• analysis
• arrangement
• categorization
• classification
• codification
• desquamation
• division
• exfoliation
• filing
• flakiness
• foliation
• grading
• grouping
• indexing
• lamination
• pigeonholing
• placement
• ranging
• ranking
• rating
• scaliness
• sorting
• subdivision
• tabulation
• taxonomy
• typology