pregnancy which allows the physician to make better use of patient data in the ascertainment and treatment of potentially pathological conditions and which facilitates transfer of patient data to computer memory the system includes a chart upon which a data point are indicated by placement of a mark relative to a vertical measurement axis and a horizontal gestational week time axis data expressed on the chart provide a retrospective graphical representation of developmental progress through the date of the most recent entry data from the chart may be transferred into computer memory with a laser scanner a marking implement to facilitate scanning is also included application_number US 32995694 A description referring to fig1 a gestational week time axis 18 spans the distance between the margins at the approximate vertical center of the chart the beginning of the axis at the left hand margin of the paper corresponds to the end of the fifth gestational week at the right hand margin the axis terminates at a point which represents the end of the forty second week of gestation between the two margins the time axis is calibrated with marks representing one week intervals with the end of every fifth week being indicated by its corresponding numeral above and parallel to the gestational week time axis 18 lies a date strip 16 which is affixed to the chart by an adhesive strip not shown disposed upon the chart beneath it prior to adhesion of the date strip to the chart the adhesive strip may be protected by a backing so as to retain its adhesive properties the calibration of the date strip 16 is equivalent to that of the gestational week time axis 18 with the numerical date.