text: FM 2-22.3 _________________________________________________________________________________
  existence of relationships; not the nature, degree, or duration of those
  relationships.
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  Figure 12-2. Example of an Association Matrix.
  12-23. The activities matrix (Figure 12-3) is a rectangular array of
  personalities compared against activities, locations, events, or other
  appropriate information. The kind and quality of data that is available to the
  collector determines the number of rows and columns and their content. The
  analyst may tailor the matrix to fit the needs of the problem at hand or he
  may add to it as the problem expands in scope. This matrix normally is
  constructed with personalities arranged in a vertical listing on the left side of
  the matrix, and events, activities, organizations, addresses, or any other
  common denominator arranged along the bottom of the matrix. This matrix
  is critical for the study of a group’s internal and external activities, external
  ties and linkages, and even modus operandi. As with the association matrix,
  confirmed or “strong” associations between individuals and non-personal
  entities are shown with a solid circle or dot, while suspected or “weak”
  associations are illustrated by an open circle.
  12-24. Using matrices, the analyst can pinpoint the optimal targets for
  further intelligence collection, identify key personalities within an
  organization, and considerably increase the analyst's understanding of an
  organization and its structure. Matrices can be used to present briefings or to
  store information in a concise and understandable manner within a database.
  Matrices augment but cannot replace SOPs or standard database files. It is
  possible, and sometimes productive, to use one matrix for all associations.
  This is done routinely using the automated systems mentioned in paragraph
  13-6.