Acceptable Targets

The fourth question we are to answer in defining what constitutes terrorism is what types of targets are acceptable. Moreover, we are to decide how much action is required to be considered a terrorist act. We all know that terrorist groups successfully use the internet as a recruiting tool, but an
article I read recently includes cyber attacks as a form of terrorism. These cyber attacks can severely damage a country's economy and infrastructure. In our technology-driven age I believe this is an important distinction to make in defining terrorism. Although I do not know of any today, in the future there may be organizations, with specific political motivations, that only use "cyber attacks" to attain desired interests. Are these to be considered terrorist or criminal acts?