Entwicklung series

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The Entwicklung series (from German Entwicklung lit. 'development'), more commonly known as the E-Series, was a late-World War II attempt by Nazi Germany to produce a standardised series of tank designs. There were to be standard designs in five different weight classes (E-10, E-25, E-50, E-75 and E-100) from which several specialised variants were to be developed. Design standardisation was envisioned to bring improvements over extreme complexity of previous tank designs that resulted in poor production rates and mechanical unreliability.