PERA Reference Model Tutorial
PERA stands for Purdue Enterprise
Reference Architecture
It was developed to provide a "Model" of the Full Enterprise
Life Cycle that can be applied to any industry, from oil refineries to
discrete manufacturing.
The PERA model is usually represented by a block model that
looks like this.
Let's see how this model relates to an Enterprise.
Every Enteprise Has 3 Main Components
- Facilities
- People, and
- Control & Information Systems.
These begin with the initial Definition of an Enterprise, and
continue until the eventual Dissolution of the Enterprise.
An Enterprise May be Divided into 8 Phases
| Feasibility Study - |
This includes Enterprise Definition, Market Research,
Business Plan, etc. |
| Enterprise Master Planning - |
In engineering projects, this phase includes Conceptual
Engineering and IT Master Planning. Ideally, these are combined with
human and organizational aspects in an Enterprise Master Plan as
described in the PERA Master
Planning Methodology. |
| Preliminary Engineering - |
This includes schematic definitions of plant physical,
logical, and human structure (eg. P&ID and System Architecture
Diagrams). |
| Detailed Engineering - |
This includes physical ( 3 Dimensional ) plant design
as well as software configuration and programming. Detailed Engineering
phase also includes Procurement of materials and Contracting for
services. |
| Construction - |
Includes Construction, Installation, Startup and
Training, administration of Contracts and receipt of materials and
systems. May also include Logistics and Transportation of materials to
construction site. |
| Operations and Maintenance - |
Includes technical support and upgrades of physical
plant and systems. It also includes ongoing retraining of personnel. |
| Decommissioning - |
Physical Plant, Control and Information Systems, and
Organizations associated with shutdown facilities may be redeployed or
declared redundant. In some cases, facilities may be "moth-balled". |
| Disposal - |
Includes demobilization or reassignment of personnel,
and reassignment or liquidation of assets. |
The PERA Model Combines Concepts of:
- Physical, Human, and Information Components of an Enterprise
- "Phases" in the life-cycle of an Enterprise:
When these are superimposed, the model looks like this.
In the course of developing the Purdue Enterprise Reference
Architecture, the detailed structure during initial and final phases of
the Enterprise were refined. A set of detailed steps and associated
"deliverables" were defined for each phase. Also, during the
Feasibility and Conceptual Phases, it was concluded that it was too
early to specifically address the "Human and Organizational" Component,
and after Decommissioning the Human component of the Enterprise was
Demobilized. This resulted in the model above.
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