A hypothetical Norwegian household waste management sys¬tem was modelled. In 2011 56% of Norwegian household waste was incinerated, 40% was collected for recycling, 2% was landfilled and 2% received other treatment (SSB, 2012a). Landfilling of organ¬ic waste was forbidden in 2009. Most municipalities collect from households using a two- or three-bin, or container, system. In addi¬tion most municipalities have neighbourhood collection points, where household deliver glass and metal waste for recycling. Household source-separated waste such as wood, garden waste, EE-waste and hazardous waste has to be brought to recycling cen¬tres (EE-waste can also be delivered at stores retailing EE-products). The uncertainty analysis focused on the fractions collected from households and delivered to glass/metal recycling, while source-separated garden waste, textiles, EE-waste and wood were left out of the calculations, as was bulky waste delivered to the recycling centres. We assumed a three-bin system in addition to collection points for glass and metals. The waste was assumed source-separated into the following fractions: (1) mixed waste, (2) paper and cardboard, (3) plastic, and (4) glass and metals (Fig. 1). Sorting of food waste has been implemented in only some cities in Norway so far, and was not included in the assessments of the waste system. However, we included food waste sorting in the comparative assessment of alternative scenarios performed subse¬quently. All the source-separated recyclables were sent to Material Recovery Facilities (MRFs). Paper was sorted in three fractions plus residues, plastic in two fractions plus residues, and glass and met¬als in three fractions without residues. All the waste fractions were followed to their end destination, meaning that avoided environ¬mental impact from substitution of virgin materials was included. Mixed waste was incinerated with heat recovery. The destination of the incinerator residues, such as fly ash and bottom ash, was not included; neither was metal extraction from the bottom ash.