Project Evaluation Tree

The program developed was the Combat-Oriented Mishap Prevention Analysis System (COMPAS). It used two analytical charts. One, the COMPAS A chart, was basically a big positive tree showing the overall organization of a typical TAC wing, broken down organizationally and then broken down into the people, procedures, and facilities and hardware for that particular part of the organization. 

The COMPAS B chart was an analytical tree that contained evaluation criteria to be applied to the personnel, procedures, and/or facilities and hardware identified or selected for evaluation on the A chart. It could be used as an inspection, accident investigation, or operational readiness tool. 

System Safely for the 21 Century The Updated and Revised Edition of System Safety 2000, by Richard A. Stephans 

and to U.S. Army Corps of Engineers safety professionals at their conference in Bethesda. In 1990, PET was included in courses presented to DOE-contracted personnel at the Nevada Test Site. 

The project evaluation tree is an analytical tree to be used primarily as a graphic check in basically the same manner as the management oversight and risk tree (see Chapter 18). The PET chart, however, contains fewer than 200 event symbols and no transfers the MORT chart contains approximately 1,500 events symbols, multiple transfers, transfers within transfers, and drafting breaks. The PET chart is divided into three branches procedures, personnel, and plant and hardware. 

---

The operating hazard analysis (OHA) is normally started and sometimes completed during this phase, even though, if adequate information is available, the OHA may be initiated in the design phase. Hazards associated with the human interface and with operating and maintenance procedures should be identified at this time. Project evaluation tree (PET) analysis is the preferred technique for performing OHAs. 

In all cases, a very important analysis and control effort should be initiated and, if sufficient data are available, completed during the production phase. The operating hazard analysis (OHA) focuses on the human interface with the end product. It examines the adequacy of maintenance and operating procedures and instructions and, if appropriate, the adequacy of the organization and training of maintenance and operations personnel. The recommended technique for completing the OHA is the project evaluation tree (PET) analysis. 

Project evaluation tree (PET) analysis is recommended as the primary evaluation technique. 

As soon as practical, consistent with SSPP guidance, an OHA is prepared by the SSWG. Project evaluation tree (PET) analysis is the recommended technique. 

The management oversight and risk tree (MORT) chart is a large, complex, negative tree (see Chapter 18). Even though the project evaluation tree (PET) is depicted as a positive tree, it is mentally converted and used as a fault tree for accident analysis applications (see Chapter 16). 

Analytical trees are also very useful as feeder documents for several hazard analysis techniques, for example, failure mode and effects analysis (Chapter 14), fault tree analysis (Chapter 15), energy trace and barrier analysis (Chapter 13), and project evaluation tree analysis (Chapter 16), the primary hazard analysis tools for many projects. Virtually any analytical technique or any type of analysis can be simplified by starting with the analytical tree as a base document. 

The purpose of the project evaluation tree is to provide a relatively simple, straightforward, and efficient method of performing an in-depth evaluation or analysis of a project or operation. It is best suited for performing operating hazard analysis and accident analysis. It can also be a valuable review and inspection tool. If adequate information is available, PET analysis may be helpful in performing preliminary hazard analysis, subsystem hazard analysis, and system hazard analysis. 

The project evaluation tree (PET) can be used to evaluate and analyze common operating and maintenance procedures and personnel, as well as common acquisition, construction, installation, testing, and manufacturing processes (see Chapter 16). 

Project Evaluation Tree A system safety analytical technique which was developed from the more extensive management oversight and risk tree (MORT) method of analysis. A simplified and efifieient method to evaluate a project or operation. Especially usefiil in the analysis of accidents and hazards. 

---