The report presents a comparison of different assessment methods and the state on the plaice stock (Pleuronectes platessa) in Icelandic waters. Four alternative assessment methods are used: age-based ADAPT, length-based ADAPT, age-disaggregated dynamic and surplus production model. Most of the data used in this study are from the Marine Research Institutes (MRI). Age-disaggregated observations are used as input data for the age-based ADAPT method and age-disaggregated dynamic production model. For the length-based ADAPT method, the length frequency data are used as input source and converted into age using slice method and then used as input data for the length-based ADAPT model and catch by year,biomass indices and CPUE for Surplus production model. Reference Points model with R-S relationship (B-H) is used to estimate the stock state.