when desining any part models either solid modelling like plastics or die casting parts and sheet metal parts the error message popping out weakest features in the part must be highlighted on the part model while designing with a red colour,this will ensure the designer to take preventive steps to update the model at the right time before the part is released to the manufacturer.weak feature exists when the hole or slot is very close to the sheetmetal edges and weaker wall thickness or rib is not provided the plastic or die casting parts.