Perubahan Persepsi Ketidakjelasan Peran dan Persepsi Efektivitas Kerja Melalui Intervensi Sosialisasi Uraian Jabatan (Suatu Studi pada Customer Service Bank XY, Regional Jakarta 2) = The Changes of Role Ambiguity Perception and Work Effetivity Perception by Intervention of Job Description Socialization (a Study pf The XY Bank's, Jakarta Regional 2 Customer Service Employee)