Some real-time strategy (RTS) games as well as most turn-based strategy (TBS) games employ this type of tech tree.
The Classic tech tree is the one where extensive research into new technologies must be conducted parallel to the progression of a game.
1.8 What happens after researching everything. 1.7 Balance between civilian and military techs. 1.4 Prerequisites for technology advances. Analysis of a tech tree can lead players to memorize and use specific build orders. The tech tree is the representation of all possible paths of research a player can take, up to the culmination of said sequence.Ī player who is engaged in research activities is said to be "teching up", "going up the tech tree", or "moving up the tech tree". Each technology that a player researches will open up one or more new options, but may or may not, depending on the computer game, close off the paths to other options. Typically, at the beginning of a session of a strategy game, a player will start at tier 1, and will only have a few options for technologies to research. Each level is called a tier and is often used to describe the technological strength of a player. The diagram is tree-shaped in the sense that it branches between each 'level', allowing the player to choose one sequence or another. Because these trees are technically directed and acyclic, they can more accurately be described as a technology directed acyclic graph. In strategy games, a technology, tech, or research tree is a hierarchical visual representation of the possible sequences of upgrades a player can take (most often through the act of research). 
For example, astronomy can be reached by first researching ceremonial burial and then mysticism, or by researching masonry followed by mathematics
Part of Freeciv's technology tree, showing complex dependencies between technologies.
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