The phrase "learning effectiveness" refers to the degree to which an individual is able to acquire, understand and apply new knowledge or skills. It measures how well an educational program, training course or instructional method is able to help someone learn and retain information, as well as apply it to real-world situations. The effectiveness of learning can be influenced by various factors, including the learner's prior knowledge and experience, their motivation and interest in the subject matter, as well as the quality of instruction and resources provided.