The best ESL resources are ones which are assessment-based, not program-based. Clearly, one-size-fits-all ESL resources would not work equally as well for divergent English-language learners. Catering resources to the needs of the learner makes sense and reliable assessments can pinpoint relative strengths and specific deficits. With targeted assessments, If they know it, they will show it; if they don’t, they won’t. Get 13 free ESL reading assessments in this informative post.