Risk tree

MORT Management Oversight and Risk Tree analysis lohnson, 197.1... 

FIGURE 6.6. Management Oversight and Risk Tree (lohnson, 1980). 

Stand structure is altered rapi y in some areas by salvage logging of high-risk trees as a result, species composition is changing, and wildlife habitat is being altered. 

Both differ in the interest rate used for discounting and the definition of the expected return. In case of the NPV the expected rate of return is used whereby the ROV utilizes the risk-tree rate of return. I.e. the decisions are independent from demand fluctuations by utilizing expectations. 

A last reference here is the Guide to Use of the Management Oversight and Risk Tree (MORT). In the abstract for that publication, MORT is described as a comprehensive analytical procedure that provides a disciplined method for determining the systemic causes and contributing factors of accidents. This reference to performance errors is of particular interest. 

Guide to Use of the Management Oversight and Risk Tree (SSDC-I03). Washington DC U.S. Department of Energy, November 1994. 

These are but a few of them single event theory chain of events theory epidemiological models systems theory models multilinear events sequencing human factors models life change unit theory motivation-reward satisfaction models and the management oversight and risk tree model. 

The definition of an accident contained in the original literature on MORT management oversight and risk tree) indicated that an injury was preceded by sequences of planning and operational errors which (a) failed to... 

Most causation models have minimized less than adequate design and engineering concepts and outcomes as a source of causal factors for hazards-related incidents, with one significant exception. That exception is MORT—the management oversight and risk tree. Concepts on which MORT is based have influenced my thinking greatly, and I am indebted to all who worked on the creation and betterment of MORT. 

In this supporting discussion, the influence of system safety concepts will be evident, as will the concepts on which MORT (management oversight and risk tree) is based. 

This causation model puts a major focus on less than adequate management practices that impact on the operations system as a source from which causal factors derive. A borrowing of significance is taken from the Guidelines to Use of the Management Oversight and Risk Tree to emphasize focusing on the system ... 

The heart of the book is its presentation of Sequentially Timed Events Plotting (STEP). The accident investigation methodology presented relies on a new conceptual framework, building on system safety technology and the safety assurance systems of MORT (management oversight and risk tree). 

Or, assume that the causation model is to relate to the concepts on which the management oversight and risk tree is based (a) the system safety idea and (b) an understanding that causal factors may derive from workplace or work methods design. 

And it is appropriate to recognize that system safety concepts were foundational in the development of MORT (management oversight and risk tree). References to system concepts are frequent in Johnson s MORT Safety Assurance Systems and in other literature on MORT. 

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