SB389,12,14 (4) District boundaries shall coincide with ward boundaries and, to the extent consistent with sub. (1), shall coincide with the boundaries of political subdivisions. The number of political subdivisions divided among more than one district shall be as small as possible. When there is a choice among political subdivisions to divide, the more populous political subdivisions shall be divided before the less populous, except that this requirement does not apply to a legislative district boundary drawn along a county boundary which passes through a city with territory in more than one county.

SB389,12,16 (5) Districts shall be composed of convenient contiguous territory. Areas which meet only at the points of adjoining corners are not contiguous.

SB389,12,20 (6) Districts shall not be drawn with the intent or result of denying or abridging the equal opportunity of racial or language minorities to participate in the political process or diminishing their ability to elect representatives of their choice, whether by themselves or by voting in concert with other persons.

SB389,12,21 (7) (a) In this subsection:

SB389,13,5 1. “Geographic unit center" means that point within a population data unit approximately equidistant from the northern and southern extremities and also approximately equidistant from the eastern and western extremities of the population data unit. This point shall be determined by visual observation of a map of the population data unit, unless it is otherwise determined within the context of an appropriate coordinate system developed by the federal government or another source that the legislative reference bureau determines is qualified and objective and is obtained for use in this state with prior approval of the joint committee on legislative organization.

SB389,13,9 2. “Population data unit" means a ward, census enumeration district, block, or other unit of territory having clearly identified geographic boundaries and for which a total population figure is included in or can be derived directly from certified federal census data.

SB389,13,15 3. “X-coordinate" means the relative location of a point along the east–west axis of the state. Unless otherwise measured within the context of an appropriate coordinate system obtained for use as permitted by subd. 1., the x-coordinate shall be measured along a line drawn due east from a due north and south line running through the point which is the western extremity of this state, to the point to be located.

SB389,13,21 4. “Y-coordinate" means the relative location of a point along the north–south axis of the state. Unless otherwise measured within the context of an appropriate coordinate system obtained for use as permitted by subd. 1., the y-coordinate shall be measured along a line drawn due south from a due east and west line running through the point which is the northern extremity of this state, to the point to be located.

SB389,14,3 (b) To the extent consistent with subs. (1) to (3), districts shall be compact in form. Compact districts are those which are square, rectangular, or hexagonal in shape to the extent permitted by natural or political boundaries. When it is necessary to compare the relative compactness of 2 or more districts, or of 2 or more alternative redistricting plans, the tests prescribed by pars. (c) and (d) shall be used. Should the results of these 2 tests be contradictory, the standard under par. (c) shall be given greater weight than the standard under par. (d).

SB389,14,6 (c) 1. The compactness of a district is greatest when the length of the district and the width of the district are equal. The measure of a district's compactness is the absolute value of the difference between the length and the width of the district.

SB389,14,11 2. In measuring the compactness of a district by means of electronic data processing, the difference between the x-coordinates of the easternmost and the westernmost geographic unit centers included in the district shall be compared to the difference between the y-coordinates of the northernmost and southernmost geographic unit centers included in the district.

SB389,14,25 3. To determine the length and width of a district by manual measurement, the distance from the northernmost point or portion of the boundary of a district to the southernmost point or portion of the boundary of the same district and the distance from the westernmost point or portion of the boundary of the district to the easternmost point or portion of the boundary of the same district shall each be measured. If the northernmost or southernmost portion of the boundary, or each of these points, is a part of the boundary running due east and west, the line used to make the measurement required by this subdivision shall be drawn either due north and south or as nearly so as the configuration of the district permits. If the easternmost or westernmost portion of the boundary, or each of these points, is a part of the boundary running due north and south, a similar procedure shall be followed. The lines to be measured for the purpose of this subdivision shall each be drawn as required by this subdivision, even if some part of either or both lines lies outside the boundaries of the district that is being tested for compactness.

SB389,15,6 4. The absolute values computed for individual districts under this paragraph may be cumulated for all districts in a plan in order to compare the overall compactness of 2 or more alternative redistricting plans for the state or for a portion of the state. However, it is not valid to cumulate or compare absolute values computed using the measurements under subd. 2. with those computed using the measurements under subd. 3.

SB389,15,9 (d) 1. The compactness of a district is greatest when the ratio of the dispersion of population about the population center of the district to the dispersion of population about the geographic center of the district is one to one.

SB389,15,20 2. The population dispersion about the population center of a district or about the geographic center of a district is computed as the sum of the products of the population of each population data unit included in the district multiplied by the square of the distance from the geographic unit center of that population data unit to the population center or the geographic center of the district, as the case may be. The geographic center of the district is defined by averaging the locations of all geographic unit centers which are included in the district. The population center of the district is defined by computing the population–weighted average of the x-coordinates and y-coordinates of each geographic unit center assigned to the district, it being assumed for the purpose of this calculation that each population data unit possesses uniform density of population.

SB389,15,23 3. The ratios computed for individual districts under this paragraph may be averaged for all districts in a plan in order to compare the overall compactness of 2 or more alternative redistricting plans for the state or for a portion of the state.

SB389,16,5 (8) In preparing any redistricting plan, the legislative reference bureau shall be strictly nonpartisan. No district may be drawn for the purpose of favoring a political party, incumbent legislator or member of Congress, or other person or group or, except to the extent required under sub. (1), for the purpose of augmenting or diluting the voting strength of a language or racial minority group. Except as provided in sub. (10), in establishing districts, no use shall be made of any of the following data:

SB389,16,6 (a) The residence addresses of incumbent legislators or members of Congress.

SB389,16,7 (b) Political affiliations of registered voters.

SB389,16,8 (c) Previous election results.

SB389,16,10 (d) Demographic information except as necessary to meet the requirements of subs. (1) and (10).

SB389,16,19 (9) The number of assembly districts in any redistricting plan may not be less than 54 nor more than 100. The number of senate districts in any redistricting plan may not be more than one-third nor less than one-fourth of the number of assembly districts. Each senate district shall contain only whole assembly districts. Except as otherwise provided in this subsection, to the extent possible, each congressional district shall contain only whole senate districts. The other standards specified in this section shall take precedence where a conflict arises between those standards and the requirement of including only whole senate districts within a congressional district.

SB389,16,25 (10) In preparing any redistricting plan, the legislative reference bureau shall test the efficiency gap and competitiveness of each district and make the test results available to the public, including publishing the results on its Internet site, no later than 72 hours prior to the first public hearing on the proposed plan. The legislative reference bureau may use the data described under sub. (8) (b) to (d) to perform the tests under this subsection.

SB389,17,2 4.008 Required provisions in redistricting bills. Each bill delivered under s. 4.006 shall provide all of the following:

SB389,17,4 (1) That, wherever territory is described in the bill by geographic boundaries, the following conventions are used:

SB389,17,6 (a) Each bound continues to the intersection with the bound next named, or to the intersection with a straight-line extension of such bound.

SB389,17,8 (b) If the bound is a street, it follows the center line of the street or the center line of the street extended.

SB389,17,10 (c) If the bound is a railroad right-of-way, it follows the center line of the railroad right-of-way.

SB389,17,12 (d) If the bound is a river or stream, it follows the center of the main channel of such river or stream.