diff --git a/Lectures/Chapter4-DLP/OP-Chapter4-Part1.pdf b/Lectures/Chapter4-DLP/OP-Chapter4-Part1.pdf
new file mode 100644
index 0000000..bb122e1
Binary files /dev/null and b/Lectures/Chapter4-DLP/OP-Chapter4-Part1.pdf differ
diff --git a/Lectures/Chapter4-DLP/OP-Chapter4-Part1.pptx b/Lectures/Chapter4-DLP/OP-Chapter4-Part1.pptx
new file mode 100644
index 0000000..52c06fa
Binary files /dev/null and b/Lectures/Chapter4-DLP/OP-Chapter4-Part1.pptx differ