Designed by a BCBA and biomedical engineer, ABApref is a convenient, efficient way to perform a preference assessment. Up-to-date client preferences are vital to the effectiveness of any behaviorally based program and ABApref makes performing these assessments easy and accurate. No more worrying about reinforcer placement or calculations! Simply use the iPhone camera to take pictures of reinforcers you want to asses and launch ABApref. This app will prompt you for all necessary information and set up is a snap. The student can either select the items off the iphone or the caretaker can use as a guide for available real-life items. ABApref also controls for side bias. All data is recorded and emailed in an easy to understand format, so no need for conspicuous clipboards and notebooks.