Construal level theory (CLT) is a theory in social psychology that describes the relation between psychological distance and the extent to which people's thinking (e.g., about objects and events) is abstract or concrete. The core idea of CLT is that the more distant an object is from the individual, the more abstract it will be thought of, while the closer the object is, the more concretely it will be thought of. In CLT, psychological distance is defined on several dimensions—temporal, spatial, social and hypothetical distance being considered most important, though there is some debate among social psychologists about further dimensions like informational, experiential or affective distance. The theory was developed by the Israeli social psychologists Nira Liberman and the American psychologist Yaacov Trope. An example of construal level effects would be that although planning one's next summer vacation one year in advance (in the distant future) will cause one to focus on broad, decontextualized features of the situation (e.g., anticipating fun and relaxation), the very same vacation planned to occur very soon will cause one to focus on specific features of the present situation (e.g. what restaurants to make reservations for, going for a trip in an off-road vehicle). According to construal level theory people perceive events that vary in several types of psychological distance: temporal distance (time) spatial distances (physical space) social distances (interpersonal distances, such as distance between two different groups or two dissimilar people) hypothetical distances (imagining that an event is likely or unlikely) Psychological distance affects the extent to which we think about an event, person, or idea as high or low level, and this will influence how concrete or abstract those thoughts are: High-level construal is when people think abstractly. When thinking on this level, people are looking at the bigger picture; not focusing on details. At the high level, people focus on central features that capture the overall gist of the situation or object.