Pencegahan kenakalan siswa melalui pendekatan struktur, kultur, dan proses sebuah aplikasi riset tindakan berbasis soft system methodology (SSM) SMK Negeri 1 Kahayan Hilir = The prevention of delinquency students through approaching the structure the culture and the process in an effort to improve student achievements at SMK Negeri 1 Kahayan Hillir with qualitative methods through the soft systems methodology (SSM) / Dwi Intan Nurcahyono