Using Models for Green House Gas Mitigation, Green Tech, Page 31
Using Models for Green House Gas Mitigation | 
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LEAP Terminology
• Area: the system being studied (e.g. country or region).
• Current Accounts: the data describing the Base Year (first year) of the study period.
• Scenario: one consistent set of assumptions about the future, starting from the Current
Accounts. LEAP can have any number of scenarios. Typically a study consists of one baseline
scenarios (e.g. business as usual) plus various counter-factual policy scenarios.
• Tree: the main organizational data structure in LEAP - a visual tree similar to the one used in
Windows Explorer.
• Branch: an item on the tree: branches can be organizing categories, technologies, modules,
processes, fuels and independent “driver variables”, etc.
• Views: The LEAP software is structured as a series of different “views” onto an energy
system.
• Variable: data at a branch. Each branch may have multiple variables. Types of variables
depend on the type of branch, and its properties. In LEAP, Variables are displayed as “tabs”
in the Analysis view.
• Disaggregation: the process of analyzing energy consumption by breaking down total
demand into the various sectors, subsectors, end-uses and devices that consume energy.
• Expression: a mathematical formula that specifies the values of a variable over time at a
given branch and for a given scenario. Expressions can be simple values, or mathematical
formula that yield different results in different years.
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