Introduction: measuring caring. -- Caring and nursing science: contemporary discourse. -- Background and selection of caring instruments. -- CARE-Q and CARE/SAT and modified CARE-Q. -- Caring behaviors inventory and new version. Caring behaviors inventory for elders. -- Caring behaviors assessment tool. -- Caring behaviors of nurses scale. -- Professional caring behaviors. -- Nyberg caring assessment scale. -- Caring ability inventory. -- Caring behavior checklist and client perception of caring scale. -- Caring assessment tools and the CAT-admin. -- Peer group caring interaction scale and organizational climate for caring questionnaire. -- Caring efficacy scale. -- Holistic caring inventory. -- Caring dimensions inventory. -- Caring attributes, professional self-concept, and technological influences scale. -- Caring professional scale. -- Methodist health care system nurse caring instrument. -- Relational caring questionnaires. -- Family caring inventory. -- Nurse-patient relationship questionnaire. -- Caring behaviors inventory-short form. -- Caring nurse-patient interactions scale. -- Caring factor survey. -- The evolution of measuring caring: moving toward construct validity. -- Postscript: thoughts on caring theories and instruments for measuring caring.