Barroso Martínez, AscensiónSanguino Galván, RamónSeaman, ClaireBañegil Palacios, Tomás M.2019-07-102019-07-102019-03-26Barroso Martínez, A., Sanguino Galván, R., Seaman, C. & Bañegil Palacios, T. M. (2019) Factors contributing to familiarity degree in family firms. International Journal of Business Innovation and Research, 18 (4), pp. 503-527.1751-02601751-0252https://eresearch.qmu.ac.uk/handle/20.500.12289/9850http://dx.doi.org/10.1504/IJBIR.2019.098768This paper is a revised and expanded version of a paper entitled ‘Evaluating family engagement (familiarity) in the family firm’ presented at Family Enterprise Research Conference (FERC), Burlington (Vermont, EEUU), 4–7 June 2015.This research proposes a measuring instrument to determine the intensity of family engagement in meeting the defining and distinguishing criteria of family businesses. This proposed method enables the assessment of the different degrees of familiarity of a business on a continuous scale, where the extremes represent the companies with lower and higher degree of familiarity. The instrument, therefore, allows classify firms in function of its familiarity degree. The study was conducted in 180 Spanish family businesses. We have used a latent variable model (Rasch model) which has allowed us to define the familiarity degree construct from the existence or not of a set of items. This methodology also enables managers and institutions to identify the most uncertain perceived items. The article contributes to the existence of an objective characterisation when exploring the extent to which family members are involved in the family business, identifying its degree of familiarity.503-527enFamily BusinessFamily FirmFamiliarity DegreeFamily EngagementFamilinessMeasurement InstrumentLatent Variable ModelRasch ModelSpainArticle