At the observer's request this may be held in confidence, though its general location must be disclosed in the analysis. Date and time . Please indicate time zone and whether standard or daylight time. Glyph type , e.g. spiral, concentric circle, anthropomorphic, etc. Description of the interaction.
Photographs are especially helpful in portraying the interaction.
Photographs will be returned upon request. Sometimes photocopies are an adequate substitute for photos. Careful drawings are not entirely without value. Duration and particulars of the geometry of the interaction are important. The value of observing an interaction on days prior to and following the peak interaction to determine the sensitivity of the marker cannot be overemphasized.