PSC B521

Overview

The Product Service Code (PSC) is a governmentwide taxonomy the U.S. federal government uses to categorize what is being purchased, supporting consistent classification in FPDS/SAM for tracking, analysis, and reporting. PSCs are governed and updated through the official PSC Manual maintained by GSA on Acquisition.gov. ¹

PSC B521 identifies “Special Studies/Analysis – Historical” under Category B (Special Studies/Analysis, not R&D). Agencies assign B521 on contract actions where the predominant service is a historical study or analysis; the PSC selection is reported in FPDS/SAM to indicate what was bought. ²

See also on G2X:

• G2X — PSC B521 overview: https://app.g2xchange.com/psc/B521
• Related code: B503 — Special Studies/Analysis - Archeological/Paleontological
• Related code: B510 — Special Studies/Analysis - Environmental Assessments

What this PSC covers

• Historical studies and analyses categorized as a service (not research and development) within PSC Category B. ²
• Use when the predominant deliverable is a study/analysis focused on historical subject matter. ²
• Coding is recorded in FPDS/SAM as the “Product or Service Code” for each contract action. ³
• Selection follows the PSC Manual’s principle of coding to the predominant service on multi‑line acquisitions. ²
• Detailed sub-scope, deliverable types, and methods beyond the descriptor “Historical.” Not specified by official sources ¹
• Adjacent PSCs in the same family include B520 (Grazing/Range) and B522 (Legal), selected based on the study’s primary subject. ²

Related NAICS and PSC codes

Verified in the PSC Manual April 2025. ²

Type | Code | Descriptor

• | - | - PSC | B521 | Special Studies/Analysis - Historical PSC | B503 | Special Studies/Analysis - Archeological/Paleontological PSC | B510 | Special Studies/Analysis - Environmental Assessments PSC | B599 | Special Studies/Analysis - Other

Placement in the PSC hierarchy

• Category: B – Special Studies/Analysis (Not R&D). ²
• Subfamily: B5 – Special Studies/Analysis. ²
• Code: B521 – Historical. ²

Reporting and search considerations

• In FPDS/SAM, the PSC appears in contract data; agencies choose the code that best represents the predominant service bought. ²
• SAM.gov contract data and reports enable filtering and analysis by PSC, facilitating spend analysis and market research across awards coded B521. ³
• Users can combine PSC filters with NAICS, place of performance, agency, and date ranges in SAM.gov to isolate relevant historical study actions. ³
• To avoid misclassification, do not use R&D (Section A) PSCs for non‑R&D studies; select the Category B code that aligns with the predominant subject (e.g., B521 vs. B503). ²

Frequently asked questions

• What does PSC B521 mean?

  • It is a service code titled “Special Studies/Analysis – Historical” within Category B (not R&D). Agencies apply it when the primary purpose of a contract action is to obtain a historical study or analysis; it is reported in FPDS/SAM as the product or service code. ²

• Is B521 considered R&D?

  • No. Category B codes are explicitly “Special Studies/Analysis, Not R&D.” For R&D purchases, agencies use Section A R&D PSCs; B521 remains a non‑R&D services classification. ²

• How is B521 different from B503 or B510?

  • B521 covers historical studies broadly; B503 is for archeological/paleontological studies and B510 for environmental assessments. Select the code that matches the study’s predominant subject. ²

• What deliverables are defined for B521?

  • Not specified by official sources. The PSC Manual provides the descriptor and hierarchy placement but does not enumerate deliverable formats for B521. Not specified by official sources ¹

• Where can agencies and vendors analyze awards coded B521?

  • SAM.gov’s contract data features allow filtering, saved searches, and reporting by PSC, supporting market research on awards using B521. Some datasets may require a free login for full access. ³

Useful resources

• G2X — PSC B521 overview: https://app.g2xchange.com/psc/B521
• Product and Service Codes (PSC) Manual — April 2025 edition (PDF). ²
• PSC Manual index and document library (current and archives). ¹
• SAM.gov Contract Data — filtering and reports by PSC. ³

References

1. Product and Service Code Manual (index/library), Acquisition.gov: https://www.acquisition.gov/psc-manual
2. PSC Manual April 2025 (PDF), Acquisition.gov: https://www.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf
3. Contract Data, SAM.gov: https://sam.gov/content/contract-data