In the study of human relationships, interest in interpersonal construction is increasing because of its implications for the quality of the couple's relationship. The processes involved in construing self and others may play a key role. However, a precise methodology to study those processes has not yet been developed. The aim of this article is to present a dyadic assessment tool, the couple's grid (CG), which is inspired from constructivist and systemic perspectives. Derived from Procter's (1985) family grid, the CG is similarly based on the repertory grid technique. The CG assesses perception of self and partner, and their ideals, and also the metaperception of the partner's view (e.g., “What does your partner think about you?”). These two levels of analysis provide measures of perceived similarity, commonality, and sociality. This article describes the development of CG as an assessment tool with a case illustration.