Further information about the Five Case Business Model and Business Justification Guidance can be found at The Green Book: appraisal and evaluation in central government (on GOV.UK)
Ceir rhagor o wybodaeth am y Model Busnes Pum Achos a'r Canllawiau ar Gyfiawnhad Busnes ar wefan Llywodraeth y DU yn The Green Book: appraisal and evaluation in central government (on GOV.UK)