A map should always include information about projection, horizontal and vertical datums, contour interval and scale. Map resolution indicates how accurately the location and shape of map features can be depicted for a given map scale.
Scale is the extent of reduction, expressed as a ratio, to represent the Earth's surface on a map.
It would be difficult to represent area features smaller than 100m wide or long because they would be 1mm wide or long on the map. Map accuracy indicates how accurately features are depicted, including quality of the source data, the map scale, drafting skills, and the width of the lines used to represent the features. Derived data should always include details about the way the data was sourced. These details should be included in the metadata. Ideally this information should be published with the map.