After the archaeological excavation of Takeda-uji yakata (residence of the Yoshikiyo TAKEDA) was conducted, research that focused on the Nobutora era, prior to the Shingen era, as well as on the Katsuyori era, which was posterior to Shingen era, made progress.
武田氏館など考古学的な発掘調査も進み、信玄期以外にも前代の信虎期や後代の勝頼期へも視点が向けられるようになった。