The invention relates to a method and apparatus for delivering a test, such a test to a candidate. The invention also concerns an apparatus and method of assessing the relative cognitive ability of a candidate. The invention also concerns a method of assessing the progress of a candidate in response to a learning program. The test, assessing or learning program comprise delivering a series of questions type to a candidate, the questions increasing in difficulty as the candidate successfully completes easier questions, the questions being delivered to the candidate in ranges. The questions may be "Swaps" type questions. The candidate may provide their confidence that their answer to any question is correct. A quantifier may be used to assess the candidates progress and/or cognitive skills.