Examples of sensitivity and uncertainty analysis performed with ERMIN: (a) sensitivity to roof material of the predicted dose in a semi-detached brick house environment following wet deposition; (b) sensitivity to occupancy of predicted dose in a multi-storey building environment following dry deposition; (c) uncertainty of predicted dose in an example scenario with no options applied; (d) uncertainty on duration that the residual annual dose will exceed 5 mSv in an example scenario where three different strategies might be applied. All doses given are external normal-living integrated over 1 year from the time given from 1 MBqm⁻² of ¹³⁷Cs calculated by ERMIN. The box for each marker indicates the inter-quartile range (IQR), the range from quartile 1 (Q1) to quartile 3 (Q3), 50% of results are contained in the box, the line in the box is the 2nd quartile or the median. The lower whisker is Q1 – 1.5IQR and the upper whisker is Q3 + 1.5IQR. If none of the data are at or beyond the limit of the whisker then the whisker will be truncated. If the distribution is normal then nearly all results would lie within the range of the whiskers. The points beyond the whiskers are individual outlying results.