---
ref_id: PR19
ref_type: Process
ref_name: "Estimate Activity Resources"
version: "1.0.0"
status: Active
pmbok8_source: "PMBOK8 Guide §2.6"
companion_ref_shortcode: PG-APG-5.16
related_skills:
  - SKL-03-17
related_artifacts:
  - A26
file_path: "reference/processes/PR19-estimate-activity-resources.md"
---
# PR19 — Estimate Activity Resources

## Classification
- **Performance Domain:** Resources
- **Process Group:** Planning
- **PMBOK 8 Reference:** Section 2.6
- **Process Groups Practice Guide Reference:** Section 5.16 (implied)

---

## Purpose
Estimate Activity Resources is the process of estimating team resources and the type and quantities of material, equipment, and supplies necessary to perform project work. The key benefit is that it identifies the type, quantity, and characteristics of resources required to complete the project, allowing for more accurate cost and duration estimates.

---

## Inputs
- Project management plan (resource management plan, scope baseline)
- Project documents: activity attributes, activity list, assumption log, cost estimates, resource calendars, risk register
- Enterprise environmental factors
- Organizational process assets

---

## Tools & Techniques
- Expert judgment
- Bottom-up estimating
- Analogous estimating
- Parametric estimating
- Data analysis (alternatives analysis)
- Project management information system
- Meetings

---

## Outputs
- Resource requirements
- Basis of estimates
- Resource breakdown structure (RBS)
- Project documents updates (activity attributes, assumption log, lessons learned register)

---

## Key Concepts
- Resource requirements identify the types and quantities of resources required for each activity.
- The resource breakdown structure (RBS) is a hierarchical representation of resources by category and type.
- Bottom-up estimating aggregates resource estimates at the activity level then rolls up to work packages and control accounts.
- Resource estimates directly feed into duration estimates (PR11) and cost estimates (PR15).
- Resource availability and skill levels influence activity duration — not a simple linear relationship.

---

## Source Traceability
- PMBOK 8: Section 2.6 (Resources Performance Domain — Key Concepts)
- Process Groups Practice Guide: Section 5.16 (Estimate Activity Resources)

---

## Cross-References

| Related Item | Type | Relationship |
|---|---|---|
| A26 | Artifact | Primary artifact produced or updated by this process |
| SKL-03-17 | Skill | Skill that executes this process |

## Practitioner Notes

Practitioners executing this process should seek answers to the following questions:
1. Are resource estimates based on current availability calendars and skill profiles?
2. Have multiple estimation techniques been applied and documented?
3. Are resource constraints and dependencies across activities identified?
4. Is the basis of resource estimates documented for audit purposes?
5. Are resource leveling implications assessed in relation to the schedule?

## Change Log

| Version | Date | Description | Author |
|---|---|---|---|
| 1.0.1 | 2026-06-03 | Added Cross-References, Practitioner Notes, and Change Log sections (F-12 Batch 4) | PMO Director |
