Some of the factors that need to be taken into consideration when developing high strength steels suitable for thin slab casting are briefly discussed. These include the effect of titanium on high temperature precipitation and properties, ductility at temperatures below the solidus, the potential for precipitation of VN and AlN during equalisation, the effect of equalisation temperature on properties, factors affecting recrystallisation during rolling, the effects of end water cool temperature and coiling temperature on properties and an indication of the levels of V and N required to achieve yield strengths in the range 50-80 ksi.