Another reason lies in the presentation of the findings as a “model” when in fact it was primarily a description of our data and not a generalized model. The “model” states that the time for a round of chromosome replication(C) and the time between the end of around of replication and cell division(D) are constants over a specific range of growth rates. Thus, cell division takes place C + D min after initiation of each round of chromosome replication. Subsequently, the model was extended to include (I), defined as the interinitiation time, i.e., the time required for the cell to achieve the potential to initiate chromosome replication (Helmstetter et al., 1968). Accordingly, in a purely phenomenological sense, E.coli duplication can be described as I + C + D, irrespective of the durations of I, C, and D. Later that same year, Ole Maaløe and I reconnected at Argonne National Laboratory during a presentation of the model.