This article describes the following:

Logica models are built with just two basic elements: nodes and links.

Nodes store values, which can be numbers, text, boolean or dates.

Nodes have a time dimension, which can be months, years or custom.

Variables are nodes that have values that change over time. Each time period can store a unique value.

Constants are nodes that have values that do not change over time. Each time period has the same value.

Links transfer values between two nodes.

Links can shift values over time.

Links can transform values.

Nodes and links are combined to create a graph, or logical tree.

The graph is essentially one big formula. When any input value is changed, The calculation is automatically triggered, and updates the values of affected nodes after iterating through all time steps.