diff --git a/uml/Makefile b/uml/Makefile
new file mode 100644
index 0000000..9516bb3
--- /dev/null
+++ b/uml/Makefile
@@ -0,0 +1,8 @@
+
+all: png svg
+
+png:
+	plantuml -tpng *.puml
+
+svg:
+	plantuml -tsvg *.puml
diff --git a/uml/use-case-diagram.png b/uml/use-case-diagram.png
new file mode 100644
index 0000000..d3790dc
Binary files /dev/null and b/uml/use-case-diagram.png differ
diff --git a/uml/use-case-diagram.puml b/uml/use-case-diagram.puml
new file mode 100644
index 0000000..e91bafe
--- /dev/null
+++ b/uml/use-case-diagram.puml
@@ -0,0 +1,57 @@
+@startuml
+
+left to right direction
+
+actor "Geschäftsführer:in" as GF
+actor "Mitglied" as MG
+actor "Übernehmer:in" as ÜB
+actor "Buchhalter:in" as BH
+actor "Kellereiinspektor:in" as KI
+
+BH <|- GF
+GF -|> ÜB
+
+rectangle Elwig {
+    usecase (Auszahlung berechnen) as AUSZ
+    usecase (Auszahlung durchführen) as AUSD
+    usecase (Parameter festlegen) as PARA
+    usecase (Traubentransportliste exportieren) as TTLE
+
+    rectangle #line:00000000 {
+        usecase (Nachricht an Mitglieder senden) as MAIL
+        usecase (Auswertungen erstellen) as STAT
+    }
+
+    rectangle #line:00000000 {
+        usecase (Mitglieder verwalten) as MGV
+        usecase (Flächenbindungen verwalten) as FBV
+        usecase (Lieferungen abwerten) as ABW
+        usecase (Trauben übernehmen) as TRÜB
+    }
+
+    FBV -|> MGV
+    AUSZ .> PARA : <<include>>
+    AUSD .> AUSZ : <<include>>
+}
+
+BH --- AUSD
+BH --- AUSZ
+GF --- PARA
+
+GF --- MGV
+MGV -- MG
+
+ÜB --- TRÜB
+TRÜB -- MG
+
+GF --- ABW
+ABW -- MG
+
+GF --- STAT
+
+GF -- TTLE
+TTLE -- KI
+
+GF --- MAIL
+
+@enduml
diff --git a/uml/use-case-diagram.svg b/uml/use-case-diagram.svg
new file mode 100644
index 0000000..d69ac3e
--- /dev/null
+++ b/uml/use-case-diagram.svg
@@ -0,0 +1 @@
+<?xml version="1.0" encoding="us-ascii" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentStyleType="text/css" height="941px" preserveAspectRatio="none" style="width:758px;height:941px;background:#FFFFFF;" version="1.1" viewBox="0 0 758 941" width="758px" zoomAndPan="magnify"><defs/><g><!--cluster Elwig--><g id="cluster_Elwig"><rect fill="none" height="928" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:1.0;" width="332" x="241" y="7"/><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacing" textLength="37" x="388.5" y="23.9659">Elwig</text></g><g id="cluster_##14"><rect fill="none" height="169" rx="2.5" ry="2.5" style="stroke:none;stroke-width:1.0;" width="284" x="265" y="399"/></g><g id="cluster_##18"><rect fill="none" height="319" rx="2.5" ry="2.5" style="stroke:none;stroke-width:1.0;" width="268" x="273" y="592"/></g><g id="elem_AUSZ"><ellipse cx="406.8629" cy="169.0726" fill="#F1F1F1" rx="100.8629" ry="22.5726" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="157" x="325.3629" y="173.8056">Auszahlung berechnen</text></g><g id="elem_AUSD"><ellipse cx="406.8388" cy="69.1678" fill="#F1F1F1" rx="106.3388" ry="23.6678" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="170" x="318.8388" y="73.9007">Auszahlung durchf&#252;hren</text></g><g id="elem_PARA"><ellipse cx="407.2059" cy="265.9412" fill="#F1F1F1" rx="92.7059" ry="20.9412" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="137" x="335.7059" y="270.6742">Parameter festlegen</text></g><g id="elem_TTLE"><ellipse cx="407.0516" cy="351.0103" fill="#F1F1F1" rx="133.0516" ry="29.0103" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="230" x="292.0516" y="354.4423">Traubentransportliste exportieren</text></g><g id="elem_MAIL"><ellipse cx="407.1389" cy="443.1278" fill="#F1F1F1" rx="126.1389" ry="27.6278" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="215" x="298.5082" y="447.0982">Nachricht an Mitglieder senden</text></g><g id="elem_STAT"><ellipse cx="406.9545" cy="528.9909" fill="#F1F1F1" rx="102.9545" ry="22.9909" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="162" x="322.9545" y="533.7239">Auswertungen erstellen</text></g><g id="elem_MGV"><ellipse cx="406.906" cy="708.1812" fill="#F1F1F1" rx="93.906" ry="21.1812" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="140" x="333.906" y="712.9142">Mitglieder verwalten</text></g><g id="elem_FBV"><ellipse cx="407.0538" cy="790.0108" fill="#F1F1F1" rx="118.0538" ry="26.0108" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="197" x="305.7784" y="794.6596">Fl&#228;chenbindungen verwalten</text></g><g id="elem_ABW"><ellipse cx="406.9679" cy="629.9936" fill="#F1F1F1" rx="97.9679" ry="21.9936" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="150" x="328.9679" y="634.7265">Lieferungen abwerten</text></g><g id="elem_TR&#220;B"><ellipse cx="407.0577" cy="872.9115" fill="#F1F1F1" rx="97.5577" ry="21.9115" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="149" x="329.5577" y="877.6445">Trauben &#252;bernehmen</text></g><!--entity GF--><g id="elem_GF"><ellipse cx="69" cy="455" fill="#F1F1F1" rx="8" ry="8" style="stroke:#181818;stroke-width:0.5;"/><path d="M69,463 L69,490 M56,471 L82,471 M69,490 L56,505 M69,490 L82,505 " fill="none" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="126" x="6" y="521.4659">Gesch&#228;ftsf&#252;hrer:in</text></g><!--entity MG--><g id="elem_MG"><ellipse cx="685.5" cy="677" fill="#F1F1F1" rx="8" ry="8" style="stroke:#181818;stroke-width:0.5;"/><path d="M685.5,685 L685.5,712 M672.5,693 L698.5,693 M685.5,712 L672.5,727 M685.5,712 L698.5,727 " fill="none" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="56" x="657.5" y="743.4659">Mitglied</text></g><!--entity ?B--><g id="elem_&#220;B"><ellipse cx="69" cy="633" fill="#F1F1F1" rx="8" ry="8" style="stroke:#181818;stroke-width:0.5;"/><path d="M69,641 L69,668 M56,649 L82,649 M69,668 L56,683 M69,668 L82,683 " fill="none" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="103" x="17.5" y="699.4659">&#220;bernehmer:in</text></g><!--entity BH--><g id="elem_BH"><ellipse cx="69" cy="138" fill="#F1F1F1" rx="8" ry="8" style="stroke:#181818;stroke-width:0.5;"/><path d="M69,146 L69,173 M56,154 L82,154 M69,173 L56,188 M69,173 L82,188 " fill="none" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="91" x="23.5" y="204.4659">Buchhalter:in</text></g><!--entity KI--><g id="elem_KI"><ellipse cx="685.5" cy="320" fill="#F1F1F1" rx="8" ry="8" style="stroke:#181818;stroke-width:0.5;"/><path d="M685.5,328 L685.5,355 M672.5,336 L698.5,336 M685.5,355 L672.5,370 M685.5,355 L698.5,370 " fill="none" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="131" x="620" y="386.4659">Kellereiinspektor:in</text></g><!--reverse link BH to GF--><g id="link_BH_GF"><path d="M69,229.63 C69,301.77 69,373.92 69,446.07 " fill="none" id="BH-backto-GF" style="stroke:#181818;stroke-width:1.0;"/><polygon fill="none" points="62,229.77,69,209.77,76,229.77,62,229.77" style="stroke:#181818;stroke-width:1.0;"/></g><!--link GF to ?B--><g id="link_GF_&#220;B"><path d="M69,525.9 C69,551.7 69,577.51 69,603.32 " fill="none" id="GF-to-&#220;B" style="stroke:#181818;stroke-width:1.0;"/><polygon fill="none" points="76,603.02,69,623.02,62,603.02,76,603.02" style="stroke:#181818;stroke-width:1.0;"/></g><!--link FBV to MGV--><g id="link_FBV_MGV"><path d="M407,763.73 C407,759.26 407,754.78 407,750.3 " fill="none" id="FBV-to-MGV" style="stroke:#181818;stroke-width:1.0;"/><polygon fill="none" points="400,750.34,407,730.34,414,750.34,400,750.34" style="stroke:#181818;stroke-width:1.0;"/></g><!--link AUSZ to PARA--><g id="link_AUSZ_PARA"><path d="M407,191.7 C407,205.91 407,224.29 407,239.21 " fill="none" id="AUSZ-to-PARA" style="stroke:#181818;stroke-width:1.0;stroke-dasharray:7.0,7.0;"/><polygon fill="#181818" points="407,243.95,411,234.95,407,238.95,403,234.95,407,243.95" style="stroke:#181818;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="57" x="366" y="223.647">&#171;include&#187;</text></g><!--link AUSD to AUSZ--><g id="link_AUSD_AUSZ"><path d="M407,93 C407,107.28 407,125.5 407,140.51 " fill="none" id="AUSD-to-AUSZ" style="stroke:#181818;stroke-width:1.0;stroke-dasharray:7.0,7.0;"/><polygon fill="#181818" points="407,145.31,411,136.31,407,140.31,403,136.31,407,145.31" style="stroke:#181818;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="57" x="366" y="124.897">&#171;include&#187;</text></g><!--link BH to AUSD--><g id="link_BH_AUSD"><path d="M114.97,155.62 C173.35,138.24 275.62,107.8 342.07,88.03 " fill="none" id="BH-AUSD" style="stroke:#181818;stroke-width:1.0;"/></g><!--link BH to AUSZ--><g id="link_BH_AUSZ"><path d="M114.97,169 C163.52,169 242.41,169 305.82,169 " fill="none" id="BH-AUSZ" style="stroke:#181818;stroke-width:1.0;"/></g><!--link GF to PARA--><g id="link_GF_PARA"><path d="M94.49,446.35 C122.62,404.29 172.74,339.17 233,304 C259.43,288.58 291.44,279.4 320.71,273.95 " fill="none" id="GF-PARA" style="stroke:#181818;stroke-width:1.0;"/></g><!--link GF to MGV--><g id="link_GF_MGV"><path d="M94.47,525.81 C122.59,568.04 172.7,633.47 233,669 C259.39,684.55 291.41,693.91 320.68,699.53 " fill="none" id="GF-MGV" style="stroke:#181818;stroke-width:1.0;"/></g><!--link MGV to MG--><g id="link_MGV_MG"><path d="M501.22,708 C555.94,708 621.22,708 657.24,708 " fill="none" id="MGV-MG" style="stroke:#181818;stroke-width:1.0;"/></g><!--link ?B to TR?B--><g id="link_&#220;B_TR&#220;B"><path d="M97.63,703.91 C126.77,742.88 176.25,800.86 233,833 C259.15,847.81 290.48,857.14 319.24,863.02 " fill="none" id="&#220;B-TR&#220;B" style="stroke:#181818;stroke-width:1.0;"/></g><!--link TR?B to MG--><g id="link_TR&#220;B_MG"><path d="M496.31,863.97 C524.88,858.16 555.69,848.63 581,833 C615.04,811.98 643.16,775.82 661.46,747.78 " fill="none" id="TR&#220;B-MG" style="stroke:#181818;stroke-width:1.0;"/></g><!--link GF to ABW--><g id="link_GF_ABW"><path d="M132.24,519.55 C162.28,535.17 199.08,553.46 233,568 C271.27,584.41 315.47,600.2 349.62,611.74 " fill="none" id="GF-ABW" style="stroke:#181818;stroke-width:1.0;"/></g><!--link ABW to MG--><g id="link_ABW_MG"><path d="M482.24,644.37 C513.05,650.95 549,659.41 581,669 C607.3,676.88 636.52,688.13 657.18,696.52 " fill="none" id="ABW-MG" style="stroke:#181818;stroke-width:1.0;"/></g><!--link GF to STAT--><g id="link_GF_STAT"><path d="M132.41,493.99 C184.22,500.62 258.56,510.13 316.68,517.57 " fill="none" id="GF-STAT" style="stroke:#181818;stroke-width:1.0;"/></g><!--link GF to TTLE--><g id="link_GF_TTLE"><path d="M132.32,448.58 C162.06,431.81 198.6,412.76 233,399 C259.05,388.58 288.16,379.56 314.97,372.23 " fill="none" id="GF-TTLE" style="stroke:#181818;stroke-width:1.0;"/></g><!--link TTLE to KI--><g id="link_TTLE_KI"><path d="M540.18,351 C567.81,351 595.76,351 619.61,351 " fill="none" id="TTLE-KI" style="stroke:#181818;stroke-width:1.0;"/></g><!--link GF to MAIL--><g id="link_GF_MAIL"><path d="M132.32,476.24 C142.24,474.76 152.39,473.3 162,472 C205.12,466.16 252.61,460.37 294.15,455.52 " fill="none" id="GF-MAIL" style="stroke:#181818;stroke-width:1.0;"/></g><!--SRC=[bLF1Jjmm4BtxAqRq0eTKFQzMAoM23OXTX21j9MvUPn9RDTvgx7Gh2d_2aS_WbX-hxSGiwRQ7HafapxpnlETvqTWuS5iWrKe7jI8KJcqDOrouBS5HYLR8_gLnjkbV9I7Db3a2Rg5S9iXQkLOhh6DuNQPm_xn1CYZlzpNzSv6oHIUavDhjayLvobsYraYebB7VyPiF9SZb1MF5ESmViz2-N4Bsk8Y7ia2RcrOZdEcTQk4N0_zq5WMt2CTvPn-ur9rfmPD28GsQat1Y_ldsxf_GkYCX1zblwDCf-feJlqUl0XgqJcCx8g_pctoAh8Xt6pIEk5Ur9QULTGZuCwmLfWvLjJfZiN2lw8DM1cUVncUKDZdxYWj9IlW1SWDf79wJHLEF1w_pYzLXeHUxGt9UB1f0yepypGy5jrLUnOAd_-VpZi8Ff5qOyyYY_7A8Nkh-HKWq6sNgWScqQ5dyfMYbi44Qu7mJHAGP5LyFqUFbG_-QF3bUzqrmppkLlbSqLI8Q_04V5t6UC8FvN1cXkneNYvG-3Ua8cwQVebMpB1jSir_VHUFwTVH8seI6_eMuPCpJYk61OFocr5WGTFhtZsYSsh0Pl1G-OHD-dTGgME4t]--></g></svg>
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