Wis. Stat. § 853.51: Execution of will.

(1) The only method of executing a Wisconsin basic will or basic will with trust is for all of the following to occur:

(a) The testator shall do all of the following:

1. Complete the blanks, boxes and lines substantially in accordance with the instructions.

2. Sign the will.

(bc) The witnesses shall comply with s. 853.03 (2).

(2m) Any failure to comply with the instructions in a Wisconsin basic will or basic will with trust, other than the requirements for the testator’s and witnesses’ signatures, does not affect the validity of the will.