Traditionally, researchers thought of motivations to use computer systems to be primarily driven by extrinsic purposes; however, many modern systems have their use driven primarily by intrinsic motivations. Examples of such systems used primarily to fulfill users' intrinsic motivations, include on-line gaming, virtual worlds, online shopping, learning/education, online dating, digital music repositories, social networking, online pornography, gamified systems, and general gamification. Even traditional management information systems (e.g., ERP, CRM) are being 'gamified' such that both extrinsic and intrinsic motivations must increasingly be considered. Deci's findings didn't come without controversy. Articles stretching over the span of 25 years from the perspective of behavioral theory argue that there isn't enough evidence to explain intrinsic motivation and this theory would inhibit "scientific progress." As stated above, we now can see technology such as various forms of computer systems are highly intrinsic.