(i) “Can an algorithm be developed to classify engineered nanoparticles by the degree of potential hazards?”, (ii) “Which characteristics of particles and which measurement techniques should be used for the assessment of exposure to engineered nanoparticles?”, (iii) “What is the exposure to engineered nanoparticles in the workplace?”, (iv) “What are the limits of engineering controls and personal protective equipment with regard to engineered nanoparticles?”, (v) “What occupational health surveillance should be recommended for workers potentially exposed to engineered nanoparticles?”, (vi) “Should exposure registers be established for various groups of workers potentially exposed to engineered nanoparticles?”, and (vii) “Should engineered nanoparticles be treated as ‘new’ substances and evaluated for safety and hazards?”