Numerous types of cases are encountered all over the world in respect to handwriting and signature examination. The cases of forgery, disguise and fraudulent documents are quiet common. Forgery is usually done by person other than the genuine writer, whereas disguise is done by the same individual to conceal one’s own identity in commission of fraudulent activities. The forged handwritings varies from the genuine writing in characteristics such as writing slant, writing alignment, proportional size of letters, formation of letters, and introduction of tremrous and hesitation sub-consciously. Previous researches have proved handwriting as ‘Brain Writing’, indicating handwriting as a personal identification feature of any individual. In handwriting examination these characteristics are identified, examined and compared to prove the authenticity of disputed handwriting or signature. Present research is conducted on the identification and examination of such characteristics on real and prepared forensic cases of disguise and forgery using specifically design “Forensic Doc scale”. The outcomes of the study have proven this innovative design as an important tool for forensic document examiner to ascertain such handwriting characteristics and provided conclusive comparison in disputed case of forgery and disguise.