A computer system can include a program database module configured to define, at a shadow system, a shadow program database having a structure defining an upgrade to a structure of an original program database on an original system, and having data defining an upgrade to data of the original program database on the original system. The method comprises selecting a window parameter T determining a plurality of windows of a predetermined size, each window being shifted by an amount less than or equal to the window parameter T. The edit unit edits the acquired target electronic document. The driving cue adherence controller is configured to continuously determine a current level of adherence to the driving cue, and an aggregate level of adherence to the driving cue based on the continuously determined current level of adherence to the driving cue over a predetermined time period.