Many times you will hear educators discussing accommodations, modifications, and interventions. Often those terms will seem interchangeable. But there is a difference between the terms.
Accommodations are changes made to instruction. These changes are made to help students fully participate in the general education curriculum without changing the instructional content. They do not change the learning expectations in regards to the goal being addressed. Typically the student product produced using accommodations is equal to the student product produced without accommodations. Some examples of accommodations would be providing more time to complete work, allowing oral responses instead of written responses, or providing a study guide before a test.
Modifications are changes made to instruction that changes or reduces learning expectations. This can include rewording test questions, shortening an assignment (odd or even numbers only), or using a different grading scale.
Interventions are strategies that are used to teach a skill in a new situation. They should include an assessment, planning, and data collection from activities of student achievement. The interventions are to be scientifically research based. Regular progress monitoring (example: once a week) should occur to determine skill growth and help shape instructional planning. Examples of scientifically research based interventions would be S.P.I.R.E or Florida Center of Reading Research activities.