Methods and systems provide a computational assistance for interactive classification that compensates for the small size of computer screens and accelerates classification tasks. Similarity indicators reduce manual search by enabling information objects to “call out” automatically to encourage a sensemaker to place related items nearby. Similarity terms signal which groups or objects match and why they match. Using these techniques, an interactive classification tool can focus a sensemaker's attention, move things into view automatically, and provide shortcuts for automatic classification. These techniques speed up classification for rule-based classification, example-based classification, and mixed strategies and have the potential for application in a wide variety of sensemaking tools.