## Definición
Elemento o concepto con aplicaciones específicas en su dominio técnico o comercial.

## tre

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## EXECUTIVE SUMMARY

This document defines the HST standard for Process Tree (`tre`), a hierarchical structure that organizes routings (`sqc`) and processes (`pss`) into complex dependency networks. Inspired by Work Breakdown Structure (WBS) concepts from PMI/PMBOK and ISA-95/ISA-88 manufacturing hierarchies, the Process Tree enables modeling of multi-level manufacturing and project workflows.

**Key characteristics:**
- Hierarchical decomposition following WBS 100% rule
- Node types: phas