Understanding PMEST in Colon Classification

S.R. Ranganathan's Colon Classification uses the PMEST formula to represent the sequence of facets in a subject heading. PMEST stands for:

• Personality
• Matter (sometimes referred to as Material or Space)
• Energy
• Subject
• Time

These are considered fundamental categories used to analyze and classify subjects.

Analyzing the Facet Order

The standard order of these facets in Colon Classification follows a specific principle. This order is generally understood as moving from the most concrete aspect of the subject to the least concrete or most abstract.

• Decreasing Order of Concreteness: The sequence starts with Personality (the core entity, most concrete) and moves towards Time (least concrete, most abstract). Therefore, option 'a' is correct.
• Fundamental Categories: PMEST themselves represent the fundamental categories Ranganathan identified for subject classification. Arranging these categories in the specific PMEST sequence constitutes an order *of* these fundamental categories. Thus, option 'd' can also be considered correct as it reflects the arrangement of these key classification components.

Evaluating Other Options

• Option 'b' (Decreasing order of association) is not the primary principle governing the PMEST sequence.
• Option 'c' (Decreasing order of classification) is vague and does not accurately describe the PMEST ordering principle.

Conclusion on Correct Options

Based on the analysis, the PMEST sequence represents a decreasing order of concreteness ('a') and is an established sequence or order of the fundamental categories ('d') used in Ranganathan's system.