19. A computer program product comprising: a non-transitory computer-readable medium comprising: a first set of codes for causing a computer to receive a plurality of document coding inputs that each assign a review code to one of a plurality of first documents, which are associated with a case within an electronic discovery system and have been previously collected from one of a plurality of custodians associated with the case, wherein the review code indicates a level of relevancy or importance in relation to the case and at least one document coding input codes a first document as privileged; a second set of codes for causing a computer to (1), in response to receiving each of the plurality of document coding inputs, determine if one or more second documents, which are associated with the case, have been previously collected from the plurality of custodians and are pending review, are similar to or same as the first document and (2) in response to receiving the at least one document coding input that codes the first document as privileged determine if one or more third documents which are associated with other cases in the electronic discovery system, have been collected from the plurality of custodians and are pending review are same as the first document; third set of codes for causing a computer to (1), in response to determining that the second documents are same as the first document, automatically assign a review code assigned to the first document to the one or more second documents that are the same as the first document and (2), in response to determining that the third documents are same as the first document, automatically assign the privilege code to the one or more third documents that are the same as the first document; a fourth set of codes for causing a computer to remove the one or more second documents from a plurality of pending review documents based on the assignment of the review code, wherein the pending review documents are included in a document review assignment currently being reviewed by a reviewer; and a fifth set of codes for causing a computer to present, on a computing device display, the one or more second documents that are similar to the first document and a confidence indicator that indicates a level of similarity between the first document and a presented second document, wherein the reviewer makes a determination based on the confidence indicator as to whether the presented second document reaches a level of similarity to the first document to justify assigning the review code to the presented document.
19. A computer program product comprising: a non-transitory computer-readable medium comprising: a first set of codes for causing a computer to receive a plurality of document coding inputs that each assign a review code to one of a plurality of first documents, which are associated with a case within an electronic discovery system and have been previously collected from one of a plurality of custodians associated with the case, wherein the review code indicates a level of relevancy or importance in relation to the case and at least one document coding input codes a first document as privileged; a second set of codes for causing a computer to (1), in response to receiving each of the plurality of document coding inputs, determine if one or more second documents, which are associated with the case, have been previously collected from the plurality of custodians and are pending review, are similar to or same as the first document and (2) in response to receiving the at least one document coding input that codes the first document as privileged determine if one or more third documents which are associated with other cases in the electronic discovery system, have been collected from the plurality of custodians and are pending review are same as the first document; third set of codes for causing a computer to (1), in response to determining that the second documents are same as the first document, automatically assign a review code assigned to the first document to the one or more second documents that are the same as the first document and (2), in response to determining that the third documents are same as the first document, automatically assign the privilege code to the one or more third documents that are the same as the first document; a fourth set of codes for causing a computer to remove the one or more second documents from a plurality of pending review documents based on the assignment of the review code, wherein the pending review documents are included in a document review assignment currently being reviewed by a reviewer; and a fifth set of codes for causing a computer to present, on a computing device display, the one or more second documents that are similar to the first document and a confidence indicator that indicates a level of similarity between the first document and a presented second document, wherein the reviewer makes a determination based on the confidence indicator as to whether the presented second document reaches a level of similarity to the first document to justify assigning the review code to the presented document. 24. The computer program product of claim 19 , wherein the second set of codes is further configured to cause the computer to determine if the one or more second documents include a predetermined threshold of words or phrases included in the first document.