cost effectiveness?

Here is a quote from a doc from the government of New Zealand "A Review of the Literature on Computer-Assisted Learning, particularly Integrated Learning Systems, and Outcomes with Respect to Literacy and Numeracy" (2000):

1. Computer-assisted learning, especially an integrated learning system, is a relatively costly option as an intervention. Given that, overall, its effectiveness falls below the mean of all other types of intervention, schools need to think carefully about cost effectiveness, notwithstanding other value added features of technology they may perceive.
(…)
4. Consideration should be given as to whether the pedagogical approach of the software is compatible with classroom methods. Similarly, consideration should be given as to whether the content of the ILS curriculum matches that of the school curriculum and whether the type of knowledge and skills and the way they are assessed on the system matches curriculum assessment tasks.