digraph "Genealogy tree of programming languages - Algol & Fortran family" {
    size = "7,7";
    node [color=white, style=filled]
    rankdir=BT;

    "Algol 60" -> "CPL (1963)" -> "BCPL (1966)" -> "C (1972)" -> "C++ (1983)"
    "Algol 68" -> "C (1972)"
    "C (1972)" -> "Ratfor (1976)"
    "C (1972)" -> "C89, C90"
    "C++ (1983)" -> "C89, C90"
    "C89, C90" -> "C99, C11"
    "C89, C90" -> "C++98"
    "C++ (1983)" -> "C++98"
    "C++98" -> "C++11"
    "C99, C11" -> "C++11"

    "FLOW-MATIC (1955)" -> "COBOL (1960)"
    "COBOL (1960)" -> "COBOL-85"
    "COBOL-85" -> "COBOL 2002"
    "C++98" -> "COBOL 2002"
    "Smalltalk (1972)" -> "COBOL 2002"

    "COBOL (1960)" -> "PL/I (1964)"
    "Fortran II (1958)" -> "PL/I (1964)"
    "Algol (1958)" -> "PL/I (1964)"

    "Speedcoding (1953)" -> "Fortran (1955)"
    "Fortran (1955)" -> "Fortran II (1958)"
    "Fortran II (1958)" -> "Fortran IV (1966)"
    "Fortran IV (1966)" -> "Fortran 77"
    "Fortran IV (1966)" -> "Ratfor (1976)"
    "Fortran 77" -> "Fortran 90, 95"
    "Fortran 90, 95" -> "Fortran 2003, 2008"
    "Fortran II (1958)" -> "BASIC (1964)"
    "BASIC (1964)" -> "Visual Basic (1991)"

    "Fortran (1955)" -> "Algol (1958)"
    "Algol (1958)" -> "Algol 60"
    "Algol 60" -> "Simula (1962)"
    "Simula (1962)" -> "Simula 67"
    "Simula 67" -> "C++ (1983)"
    "Simula 67" -> "Smalltalk (1972)"
    "Algol 60" -> "Algol 68"
    "Algol 60" -> "Pascal (1970)"
    "Pascal (1970)" -> "Modula-2 (1978)" -> "Modula-3"
    "Pascal (1970)" -> "Delphi (1995)"
    "Algol 68" -> "Ada (1983)"
    "Ada (1983)" -> "Ada 95"

    subgraph early50s {
        rank=same
        "Speedcoding (1953)"
        "FLOW-MATIC (1955)"
    }

    subgraph late50s {
        rank=same
        "Algol (1958)"
        "Fortran II (1958)"
        "COBOL (1960)"
    }

    subgraph late60s {
        rank=same
        "Fortran IV (1966)"
        "BCPL (1966)"
        "Simula 67"
        "Algol 68"
    }

    subgraph early70s {
        rank=same
        "Pascal (1970)"
        "Smalltalk (1972)"
        "C (1972)"
    }

    subgraph late70s {
        rank=same
        "Ratfor (1976)"
        "Fortran 77"
        "Modula-2 (1978)"
    }

    subgraph mid80s {
        rank=same
        "C++ (1983)"
        "Ada (1983)"
        "Modula-3"
        "COBOL-85"
    }

    subgraph early90s {
        rank=same
        "C89, C90"
        "Fortran 90, 95"
        "Ada 95"
        "Delphi (1995)"
        "Visual Basic (1991)"
    }

    subgraph 2000 {
        rank=same
        "C++98"
        "C99, C11"
        "Fortran 2003, 2008"
    }
}