Field verification is integral to Indus' process to develop as-built drawings. Existing drawings may not truly show what the current conditions are. In most facilities, changes occur frequently and they may not all be documented. And even if the design documentation exists, as-built conditions may be quite different from designs. This situation would require field verification. Field verification would focus on what is significant from a management point of view. Experience and expertise are important factors when performing field verification. Indus has both.