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The Lexia programmes, created by Lexia Learning Systems, are comprised of several computerised activities. Each activity in the programme may have one or several different types of tasks, with each type involving a number of units. These units cover a particular subskill of the main skills targeted by the activity and will increase in difficulty as the learner progresses. The learner can only progress to the next unit if they master the skill within the current unit.

The programme also provides immediate feedback, and includes instruction and scaffolding when necessary. Scaffolding can generally involve simplifying the task by reducing choices, adjusting the complexity of language, altering the presentation and visual components of the task or providing embedded support. Additional instruction and scaffolding are presented when necessary, though if students require this more than once within a unit, the teacher is notified that the student is struggling and requires further assistance.