Cognitive Behavioral Therapy (CBT) is an evidence-based form of psychological therapy, this means that a counsellor and their client need to gather information about experiences and reactions including the thoughts, feelings, body sensations, behaviors that happen in and out of session. Collecting this information in written form is helpful because it externalizes our experience and makes information less prone to bias than information that is just ‘in our heads.’ These therapy worksheets include forms clients uses to gather data outside sessions, such as a thought monitoring record or an activity diary; forms that counsellor and client complete together in-session such as a case formulation diagram; and forms that counsellor and client start in-session and complete outside session such as a behavioral experiment worksheet or a positive belief log.