diff --git a/_bookdown.yml b/_bookdown.yml
index 53319ff..c9c8466 100644
--- a/_bookdown.yml
+++ b/_bookdown.yml
@@ -19,7 +19,11 @@ rmd_files: [
   "wrangle.Rmd",
   "tibble.Rmd",
   "tidy.Rmd",
+  "rectangle.Rmd",
   "relational-data.Rmd",
+  "list-columns.Rmd",
+  "column-wise.Rmd",
+  "row-wise.Rmd",
   "strings.Rmd",
   "factors.Rmd",
   "datetimes.Rmd",
diff --git a/column-wise.Rmd b/column-wise.Rmd
new file mode 100644
index 0000000..4f1ac34
--- /dev/null
+++ b/column-wise.Rmd
@@ -0,0 +1,16 @@
+# Column-wise operations
+
+## Introduction
+
+<!--# TO DO: Write introduction. -->
+
+### Prerequisites
+
+In this chapter we'll continue using dplyr.
+dplyr is a member of the core tidyverse.
+
+```{r setup, message = FALSE}
+library(tidyverse)
+```
+
+<!--# TO DO: Write chapter around across, etc. -->
diff --git a/list-columns.Rmd b/list-columns.Rmd
new file mode 100644
index 0000000..2aaaa57
--- /dev/null
+++ b/list-columns.Rmd
@@ -0,0 +1,16 @@
+# List columns
+
+## Introduction
+
+<!--# TO DO: Write introduction. -->
+
+### Prerequisites
+
+In this chapter we'll continue using tidyr, which also provides a bunch of tools to rectangle your datasets.
+tidyr is a member of the core tidyverse.
+
+```{r setup, message = FALSE}
+library(tidyverse)
+```
+
+<!--# TO DO: Write chapter around unnest, hoist, etc. -->
diff --git a/rectangle.Rmd b/rectangle.Rmd
new file mode 100644
index 0000000..53624ca
--- /dev/null
+++ b/rectangle.Rmd
@@ -0,0 +1,16 @@
+# Rectangle data
+
+## Introduction
+
+<!--# TO DO: Write introduction. -->
+
+### Prerequisites
+
+In this chapter we'll continue using tidyr, which also provides a bunch of tools to rectangle your datasets.
+tidyr is a member of the core tidyverse.
+
+```{r setup, message = FALSE}
+library(tidyverse)
+```
+
+<!--# TO DO: Write chapter around unnest, hoist, etc. -->
diff --git a/row-wise.Rmd b/row-wise.Rmd
new file mode 100644
index 0000000..8c76617
--- /dev/null
+++ b/row-wise.Rmd
@@ -0,0 +1,16 @@
+# Row-wise operations
+
+## Introduction
+
+<!--# TO DO: Write introduction. -->
+
+### Prerequisites
+
+In this chapter we'll continue using dplyr.
+dplyr is a member of the core tidyverse.
+
+```{r setup, message = FALSE}
+library(tidyverse)
+```
+
+<!--# TO DO: Write chapter around rowwise, etc. -->