The Osei-Bagyina Twi Articulation Test (OB-TAT) and the Osei-Bagyina Test of English articulation (OB-TEA) were developed by Albert Osei-Bagyina, a speech-language pathologist who practices in Kumasi and Accra in Ghana. Then a team of master’s speech language faculty and supervisors from Teachers College Columbia University, led by Catherine Crowley and Miriam Baigorri, created the OB-TAT and OB-TEA in a form that can be used by all speech-language therapists who work with Twi speakers from Ghana and English speakers from Ghana and some other African countries. The OB-TAT and the OB-TEA are available online to download for free and use in speech therapy and evaluations.
