Introducing early algebraic thinking

How can early algebraic thinking be introduced?

Algebra is difficult to define and different definitions will determine how and when algebraic thinking is introduced to students
Generational, transformational and meta-level activities are possible categories of algebraic thinking
It may be better to teach algebraic thinking in a less discrete manner than some curricula suggest
Introducing algebraic thinking early in the mathematics curriculum can be effective, as young students may be more successful at thinking algebraically than previously thought
Introducing algebraic thinking can be done through the general to the particular or vice versa
Approaching algebraic thinking through developing students’ notion of equivalence is effective
Using technology can enhance algebraic thinking by providing more contexts and representations