A five-item likert scale designed to measure the degree to which a person feels effectual and capable in his/her life, with an emphasis on the role played by a named person.
La Guardia, Jennifer G., Richard M. Ryan, Charles E. Couchman, and Edward L. Deci (2000), "Within-Person Variation in Security of Attachment: A Self-Determination Theory Perspective on Attachment, Need-Fulfillment and Well-Being," Journal of Personality and Social Psychology, 79 (September), 367-84.
Free access to 2023+ psychometric scales at PsychScales