This is our opinion of the differences between iReady and Let's Go Learn. Ultimately, you'll need to compare for yourself.
Fundamentally, Let's Go Learn has much more granular and diagnostic assessments. Our assessments were designed not to be summative tests but to inform instruction and answer questions for the teacher. Supporting this statement is the fact that many special education departments and thus teachers use our DORA, ADAM, and DOMA PreAlgebra assessments to create IEPs and write PLAAPFs for their students. Our assessments accurately identify students' instructional points rather than guessing at or assuming vague developmental areas.
In reading, DORA looks at 7 discrete subskills and finds students' instructional points within the linear scope and sequence of each. Within foundational mathematics, ADAM finds each student's instructional skill point with 44 sub-tests of foundational mathematics.
Likewise, both iReady and Let's Go Learn have a personalized instructional component. But given that our assessments are more granular and accurate, the prescriptive path that we generate will more quickly fill the gaps the students have. As a result, when used as an intervention tool within the regular classroom or during a pullout class, our LGL Edge series will more rapidly improve students' overall performance. We won't waste valuable instructional time on materials that are already mastered or provide lessons that are too hard.
The trade-off is that in some cases, our assessments may take longer. This is primarily true in upper-level mathematics. For example, in the case of middle school mathematics, we take the time to really dig in and map out each student's gaps across the 44 scope-and-sequences of foundational mathematics. We don't assume that if a 6th grader is at the 4th-grade level in multiplication, he is at that level in division or number theory. We actually assess to find out. We also don't draw conclusions based on one test item in a skill area. We will test with 2 to 5 items to reach an accurate conclusion. Otherwise, we'd just be another inaccurate screener.