A computer-implemented method for monitoring casing wear for a well during a drilling operation, the method comprising: determining casing design parameters for a planned well during a planning phase of the drilling operation; computing a wear value indicating an amount of estimated casing wear along a length of the planned well, based on the casing design parameters; generating a casing wear map based on the computed wear value along the length of the planned well relative to one or more of the casing design parameters, wherein the generated casing wear map is a three-dimensional, 3D, graphical representation of the estimated casing wear; visualizing the generated casing wear map via a display of a computing device, the visualized casing wear map enabling a user of the computing device to analyze the estimated casing wear for the planned well and determine an appropriate casing design for the planned well based on the analysis; wherein the method further comprises: obtaining data related to actual casing wear determined for a portion of the planned well being drilled during an operating phase of the drilling operation; comparing the computed wear value and the obtained data for the portion of the planned well to determine a deviation between the estimated casing wear and the actual casing wear; wherein the method further comprises: updating the casing design parameters using the actual casing wear data; updating the casing wear value using the updated casing design parameters where a deviation is determined; and updating the generated casing wear map using the updated casing design parameters. determining casing design parameters for a planned well during a planning phase of the drilling operation; computing a wear value indicating an amount of estimated casing wear along a length of the planned well, based on the casing design parameters; generating a casing wear map based on the computed wear value along the length of the planned well relative to one or more of the casing design parameters, wherein the generated casing wear map is a three-dimensional, 3D, graphical representation of the estimated casing wear; visualizing the generated casing wear map via a display of a computing device, the visualized casing wear map enabling a user of the computing device to analyze the estimated casing wear for the planned well and determine an appropriate casing design for the planned well based on the analysis; obtaining data related to actual casing wear determined for a portion of the planned well being drilled during an operating phase of the drilling operation; comparing the computed wear value and the obtained data for the portion of the planned well to determine a deviation between the estimated casing wear and the actual casing wear; wherein the method further comprises: updating the casing design parameters using the actual casing wear data; updating the casing wear value using the updated casing design parameters where a deviation is determined; and updating the generated casing wear map using the updated casing design parameters. updating the casing design parameters using the actual casing wear data; updating the casing wear value using the updated casing design parameters where a deviation is determined; and updating the generated casing wear map using the updated casing design parameters.