It is no secret that simulation plays an ever increasing role in solving various challenges outside the military domain. Using simulation the policy planners can examine a variety of complex solutions before their implementation as well as forecast the impact of decisions on the attainable goal in general (Silva et al 2009). Several simulators are being developed, however the lack of unified standards, task diversity and complexity raise costs for the development of a comprehensive simulator. These costs are significantly higher than in traditional software development. This begs the question of sustainability regarding a new or already absorbed simulator as costs must be justified. How to determine technology sustainability? This question preoccupies users as well as investors. It is still impossible to get a convincing answer. A few years ago the term "sustainability" was almost exclusively linked to environmental protection, and even today it is very rarely used in relation to technology sustainability. More than five years ago the authors started developing the sustainability assessment methodology IASAM (Barkane et al 2010, Aizstrauta and Ginters 2013), which is based on system dynamics simulation. After several years of validation the work continues with the second version IASAM2, which left behind the Venkantesh UTAUT acceptance model in favour of Rodger's diffusion ideas.