Fig. 3.

English translation of the data collection booklet for cassava (Manihot esculenta Crantz) trials in Rwanda. In each pair of illustrations, the one on the left represents the positive extreme (for example, “most vigorous”), while the one on the right represents the negative extreme of the same trait (“least vigorous”). The booklet is provided with clear illustrations to allow interpretation even by illiterate farmers, but also in the local language (Kinyarwanda) to improve engagement with the local partners. For each question on the card, a farmer writes the corresponding letters in the circles.