(1) What are the details of (a)(i) blocked and (ii) delayed projects and (b) houses that have been built, but needed to be (i) demolished, (ii) rebuilt and (iii) rectified due to poor workmanship; (2) whether, with reference to his reply to question 2868 on 7 November 2011, contractors who have (a) failed to complete their projects and (b) delivered poor quality housing have been identified in each province; if not, why not; if so, (3) whether they have been blacklisted; if not, why not; if so, what (a) steps has he taken in this regard and (b) are the further relevant details?