diff --git a/P04_Modularisieren_von_C_Code/work/show-dependencies/Makefile Andrin b/P04_Modularisieren_von_C_Code/work/show-dependencies/Makefile Andrin
index 174a96a..f3952c6 100644
--- a/P04_Modularisieren_von_C_Code/work/show-dependencies/Makefile Andrin	
+++ b/P04_Modularisieren_von_C_Code/work/show-dependencies/Makefile Andrin	
@@ -1,25 +1,67 @@
 SNP_SHARED_MAKEFILE := $(if $(SNP_SHARED_MAKEFILE),$(SNP_SHARED_MAKEFILE),"~/snp/shared.mk")
 
-TARGET := bin/triangle
-SOURCES := src/triangle.c src/read.c src/rectang.c
+TARGET := bin/dep2dot
+# Add all additional c-files to the SOURCES variable
+# BEGIN-STUDENTS-TO-ADD-CODE
+SOURCES := src/main.c src/data.c src/output.c
+# END-STUDENTS-TO-ADD-CODE
 TSTSOURCES := tests/tests.c
-LIBS := -lm
 
 include $(SNP_SHARED_MAKEFILE)
 
-all: modul
 
-modul: triangle.o read.o rectang.o
-gcc -o modul src/triangle.o src/read.o src/rectang.o
+# DEPFILES := ... define a list of png file names: %.c -> %.c.png
+# BEGIN-STUDENTS-TO-ADD-CODE
+DEPFILES := $(SOURCES:%.c=%.c.png)
 
-clean:
-rm -f *.o modul
+# END-STUDENTS-TO-ADD-CODE
 
-triangle.o: src/triangle.c Makefile
-gcc -c src/triangle.c
 
-read.o: src/read.c src/read.h Makefile
-gcc -c src/read.c
 
-rectang.o: src/rectang.c src/rectang.h Makefile
-gcc -c src/rectang.c
+# define dep target as .PHONEY
+# BEGIN-STUDENTS-TO-ADD-CODE
+.PHONEY: dep
+
+# BEGIN-STUDENTS-TO-ADD-CODE
+
+
+
+# define dep target depending on FULLTARGET and DEPFILES above
+# action: echo some text telling that the target is done using $@ - the echo command shall not be echoed before execution
+# BEGIN-STUDENTS-TO-ADD-CODE
+dep: $(DEPFILES) $(FULLTARGET)
+echo $@
+
+# BEGIN-STUDENTS-TO-ADD-CODE
+
+
+
+# define new suffix rule for %.png depending on %.dot
+# action: dot -Tpng $< >$@ || $(RM) $@
+# BEGIN-STUDENTS-TO-ADD-CODE
+%.png: %.dot
+dot -Tpng $< >$@ || $(RM) $@
+
+# BEGIN-STUDENTS-TO-ADD-CODE
+
+
+
+# define new suffix rule for %.dot depending on %.dep
+# action: call $(TARGET) $(@:.dot=) <$< >$@ || $(RM) $@
+# BEGIN-STUDENTS-TO-ADD-CODE
+%.dot: %.dep
+call $(TARGET) $(@:.dot=) <$< >$@ || $(RM) $@
+
+# BEGIN-STUDENTS-TO-ADD-CODE
+
+
+
+# converts any .c file into a .c.dep file by means of GCC -H switch
+# note: it removes intermediate files which were created as side effect
+%.c.dep: %.c
+$(COMPILE.c) -H -o $@.x $< 2>$@ && $(RM) $@.x $@.d
+
+
+# cleanup all results, including the ones od creating the dependencies
+dep-clean: clean
+$(RM) $(DEPFILES) $(wildcard src/*.dep src/*.dot)