Building Block 1 - Construct Maps: Construct maps (Wilson, 2004) embody this first of the four principles: that of a developmental perspective on assessment of student achievement and growth. A construct map is a well thought out and researched ordering of qualitatively different levels of performance focusing on one characteristic. Thus, a construct map defines what is to be measured or assessed in terms general enough to be interpretable within a curriculum and potentially across curricula, but specific enough to guide the development of the other components. When instructional practices are linked to the construct map, then the construct map also indicates the aims of the teaching.