The Study of Human Heredity. 7 11. Occupations, whenever possible. 12. A general description of the home influences, environment end[sic] education. 13. For each family, the sources of information. (Names, addresses and relationships to the individual who is being primarily studied.) [italics]Description of Traits and Causes of Sickness and Death.[end italics] The field worker naturally directs inquiries primarily toward the specific trait that is being studied (herein called the [italics]primary[end italics] trait). But the opportunity is utilized to learn of other traits that may be significantly or incidentally associated with the primary trait. In describing traits, the person interviewed is encouraged to talk freely while the field worker records the essential points in the description. In the case of the primary traits too much detail can hardly be obtained, and even in the associated traits she is not to be satisfied with vague terms if details can be obtained. N. B. Experience indicates that it is not desirable for the field worker to use a printed form in her interviews. Such vague terms to be used only when further details cannot be obtained, are: [italics]abscess,[end italics] without cause or location; [italics]accident; decline,[end italics] without naming disease; [italics]cancer[end italics], without specifying organ first affected; [italics]congestion,[end italics] without naming organ affected; [italics]convulsions,[end italics] without details and period of life; [italics]fever; heart trouble[end italics] and [italics]heart failure; insanity,[end italics] without details (when possible distinguish alcoholic psychoses, progressive or general paralysis, senile dementia, softening of the brain, on the one hand, and such forms as manic depressive insanity, melancholia, paranoia, dementia praecox, on the other); [italics]kidney trouble; lung trouble; marasmus; stomach trouble.[end italics] The following data are considered especially valuable as symptoms, and should at the judgment of the field worker be made the subject of inquiry: alcoholism, venereal disease (including gonorrhea and syphilis), sexual immorality, St. Vitus' dance or chorea, and sick headaches. The term "normal" should be used only to indicate that, in respect to the [italics]primary trait,[end italics] the individual is believed on trustworthy evidence to be like most people. Normal is not to be applied to persons simply because nothing is known to the contrary. [italics]Limits to Pedigree.[end italics] How far among collaterals is it desirable to extend the pedigree? This depends on the nature of the primary trait. If, as in the case of most defects, it is due to the absence of a quality essential to normal development then it will be desirable to learn at [end]