What is 'effective' use of ICT?

I have witnessed both, what i would describe as, effective and ineffective uses of ICT within the classroom. On a basic level as long as the ICT is supporting and forwarding the pupils learning (or teachers teaching) then it can be labelled as 'effective'. I have witnessed many uses of ICT which almost seem to hinder learning, breeding misconceptions and errors in knowledge, these seem to usually occur when the subject matter is of a concrete nature, for example when teaching capacity or measure as children can misinterperet what is being displayed on the IWB, in these and other cases a hands-on approach is infinitely more productive to the learner. When considering ICT as a tool for learning it is important to calculate the benefits before progressing, one model suited to this is the 'e-confidence grid' (Strategic Leadership in ICT, (2006) National College of School Leadership, Nottingham) which decribes levels of learning in relation to ICT; exchange; enrich; enhance; exchange; empower, with empowerment being the goal as this is where children have the tools and knowledge to take control of their own learning.