Hierarchy of Fears. The next step in the systematic desensitization process involves constructing what is called a hierarchy of fears, which is a list of the things that the person identifies as fearful related to flying in order from the least to the most anxiety-provoking.ierarchy of Fears. The next step in the systematic desensitization process involves constructing what is called a hierarchy of fears, which is a list of the things that the person identifies as fearful related to flying in order from the least to the most anxiety-provoking.
Under the Association of Physical Plant Administrators (APPA) there are five levels of cleaning. Please reference below for standards for each level. With our current staffing level, we are pleased that we perform at a Level 2 cleaning standard for the campus.
APTA is the only association in North America that represents all modes of public transportation. Sustainability is a core value for Parsons Brinckerhoff and the firm was a founding signatory to the APTA Sustainability Commitment program in 2009.