ðə vˈɜːsə tˈuːl wʌz səbstˈænʃəli bˈeɪst ˌɔn ɐ tˈuːl dɪvˈɛləpt baɪ pɹˈaɪswəɾɚhˌaʊs kˈuːpɚz, nˈoʊn æz sˈeɪf, wˌɪtʃ wʌz pˈɜːtʃɪst baɪ vˈɜːsə ɪn dᵻsˈɛmbɚ tˈuː θˈaʊzənd fˈoːɹ.
The Virsa tool was substantially based on a tool developed by PricewaterhouseCoopers, known as SAFE, which was purchased by Virsa in December 2004.