diff --git a/Makefile b/Makefile
index 0c4e0523..55e07282 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@
 # Make will use bash instead of sh
 SHELL := /usr/bin/env bash
 
-DOCKER_TAG_VERSION_DEVELOPER_TOOLS := 0.1.0
+DOCKER_TAG_VERSION_DEVELOPER_TOOLS := 0.4.6
 DOCKER_IMAGE_DEVELOPER_TOOLS := cft/developer-tools
 REGISTRY_URL := gcr.io/cloud-foundation-cicd
 
diff --git a/README.md b/README.md
index 10769669..cf3f47c2 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ module "log_export" {
   log_sink_name          = "storage_example_logsink"
   parent_resource_id     = "sample-project"
   parent_resource_type   = "project"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
@@ -49,11 +49,11 @@ so that all dependencies are met.
 |------|-------------|:----:|:-----:|:-----:|
 | destination\_uri | The self_link URI of the destination resource (This is available as an output coming from one of the destination submodules) | string | n/a | yes |
 | filter | The filter to apply when exporting logs. Only log entries that match the filter are exported. Default is '' which exports all logs. | string | `""` | no |
-| include\_children | Only valid if 'organization' or 'folder' is chosen as var.parent_resource.type. Determines whether or not to include children organizations/folders in the sink export. If true, logs associated with child projects are also exported; otherwise only logs relating to the provided organization/folder are included. | string | `"false"` | no |
+| include\_children | Only valid if 'organization' or 'folder' is chosen as var.parent_resource.type. Determines whether or not to include children organizations/folders in the sink export. If true, logs associated with child projects are also exported; otherwise only logs relating to the provided organization/folder are included. | bool | `"false"` | no |
 | log\_sink\_name | The name of the log sink to be created. | string | n/a | yes |
 | parent\_resource\_id | The ID of the GCP resource in which you create the log sink. If var.parent_resource_type is set to 'project', then this is the Project ID (and etc). | string | n/a | yes |
 | parent\_resource\_type | The GCP resource in which you create the log sink. The value must not be computed, and must be one of the following: 'project', 'folder', 'billing_account', or 'organization'. | string | `"project"` | no |
-| unique\_writer\_identity | Whether or not to create a unique identity associated with this sink. If false (the default), then the writer_identity used is serviceAccount:cloud-logs@system.gserviceaccount.com. If true, then a unique service account is created and used for the logging sink. | string | `"false"` | no |
+| unique\_writer\_identity | Whether or not to create a unique identity associated with this sink. If false (the default), then the writer_identity used is serviceAccount:cloud-logs@system.gserviceaccount.com. If true, then a unique service account is created and used for the logging sink. | bool | `"false"` | no |
 
 ## Outputs
 
diff --git a/examples/bigquery/billing_account/main.tf b/examples/bigquery/billing_account/main.tf
index 0ce69ffc..1350cee6 100644
--- a/examples/bigquery/billing_account/main.tf
+++ b/examples/bigquery/billing_account/main.tf
@@ -24,7 +24,7 @@ module "log_export" {
   log_sink_name          = "bigquery_example_logsink"
   parent_resource_id     = var.parent_resource_id
   parent_resource_type   = "billing_account"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
diff --git a/examples/bigquery/billing_account/variables.tf b/examples/bigquery/billing_account/variables.tf
index 37b83238..be3d4bc2 100644
--- a/examples/bigquery/billing_account/variables.tf
+++ b/examples/bigquery/billing_account/variables.tf
@@ -16,8 +16,10 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which BigQuery dataset destination will be created."
+  type        = string
 }
diff --git a/examples/bigquery/folder/main.tf b/examples/bigquery/folder/main.tf
index a95d3cb6..3e03b9c8 100644
--- a/examples/bigquery/folder/main.tf
+++ b/examples/bigquery/folder/main.tf
@@ -20,8 +20,8 @@ provider "google" {
 
 resource "random_string" "suffix" {
   length  = 4
-  upper   = "false"
-  special = "false"
+  upper   = false
+  special = false
 }
 
 module "log_export" {
@@ -31,7 +31,7 @@ module "log_export" {
   log_sink_name          = "bigquery_folder_${random_string.suffix.result}"
   parent_resource_id     = var.parent_resource_id
   parent_resource_type   = "folder"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
diff --git a/examples/bigquery/folder/variables.tf b/examples/bigquery/folder/variables.tf
index 37b83238..be3d4bc2 100644
--- a/examples/bigquery/folder/variables.tf
+++ b/examples/bigquery/folder/variables.tf
@@ -16,8 +16,10 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which BigQuery dataset destination will be created."
+  type        = string
 }
diff --git a/examples/bigquery/organization/main.tf b/examples/bigquery/organization/main.tf
index eb5dfa46..c480e768 100644
--- a/examples/bigquery/organization/main.tf
+++ b/examples/bigquery/organization/main.tf
@@ -20,8 +20,8 @@ provider "google" {
 
 resource "random_string" "suffix" {
   length  = 4
-  upper   = "false"
-  special = "false"
+  upper   = false
+  special = false
 }
 
 module "log_export" {
@@ -31,7 +31,7 @@ module "log_export" {
   log_sink_name          = "bigquery_org_${random_string.suffix.result}"
   parent_resource_id     = var.parent_resource_id
   parent_resource_type   = "organization"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
diff --git a/examples/bigquery/organization/variables.tf b/examples/bigquery/organization/variables.tf
index 9b44d8ac..6177bc0f 100644
--- a/examples/bigquery/organization/variables.tf
+++ b/examples/bigquery/organization/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which BigQuery dataset destination will be created."
+  type        = string
 }
 
diff --git a/examples/bigquery/project/main.tf b/examples/bigquery/project/main.tf
index 9fa562ec..959ed203 100644
--- a/examples/bigquery/project/main.tf
+++ b/examples/bigquery/project/main.tf
@@ -20,8 +20,8 @@ provider "google" {
 
 resource "random_string" "suffix" {
   length  = 4
-  upper   = "false"
-  special = "false"
+  upper   = false
+  special = false
 }
 
 module "log_export" {
@@ -31,7 +31,7 @@ module "log_export" {
   log_sink_name          = "bigquery_project_${random_string.suffix.result}"
   parent_resource_id     = var.parent_resource_id
   parent_resource_type   = "project"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
diff --git a/examples/bigquery/project/variables.tf b/examples/bigquery/project/variables.tf
index 9b44d8ac..6177bc0f 100644
--- a/examples/bigquery/project/variables.tf
+++ b/examples/bigquery/project/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which BigQuery dataset destination will be created."
+  type        = string
 }
 
diff --git a/examples/pubsub/billing_account/main.tf b/examples/pubsub/billing_account/main.tf
index 0088c874..5f7b3e30 100644
--- a/examples/pubsub/billing_account/main.tf
+++ b/examples/pubsub/billing_account/main.tf
@@ -24,7 +24,7 @@ module "log_export" {
   log_sink_name          = "pubsub_example_logsink"
   parent_resource_id     = var.parent_resource_id
   parent_resource_type   = "billing_account"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
@@ -32,6 +32,6 @@ module "destination" {
   project_id               = var.project_id
   topic_name               = "pubsub-example"
   log_sink_writer_identity = module.log_export.writer_identity
-  create_subscriber        = "true"
+  create_subscriber        = true
 }
 
diff --git a/examples/pubsub/billing_account/variables.tf b/examples/pubsub/billing_account/variables.tf
index e7e6e19f..32551430 100644
--- a/examples/pubsub/billing_account/variables.tf
+++ b/examples/pubsub/billing_account/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which pubsub topic destination will be created."
+  type        = string
 }
 
diff --git a/examples/pubsub/folder/main.tf b/examples/pubsub/folder/main.tf
index 1476314d..613b7ede 100644
--- a/examples/pubsub/folder/main.tf
+++ b/examples/pubsub/folder/main.tf
@@ -20,8 +20,8 @@ provider "google" {
 
 resource "random_string" "suffix" {
   length  = 4
-  upper   = "false"
-  special = "false"
+  upper   = false
+  special = false
 }
 
 module "log_export" {
@@ -31,7 +31,7 @@ module "log_export" {
   log_sink_name          = "pubsub_folder_${random_string.suffix.result}"
   parent_resource_id     = var.parent_resource_id
   parent_resource_type   = "folder"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
@@ -39,6 +39,6 @@ module "destination" {
   project_id               = var.project_id
   topic_name               = "pubsub-folder-${random_string.suffix.result}"
   log_sink_writer_identity = module.log_export.writer_identity
-  create_subscriber        = "true"
+  create_subscriber        = true
 }
 
diff --git a/examples/pubsub/folder/variables.tf b/examples/pubsub/folder/variables.tf
index e7e6e19f..32551430 100644
--- a/examples/pubsub/folder/variables.tf
+++ b/examples/pubsub/folder/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which pubsub topic destination will be created."
+  type        = string
 }
 
diff --git a/examples/pubsub/organization/main.tf b/examples/pubsub/organization/main.tf
index bc596e57..3a133411 100644
--- a/examples/pubsub/organization/main.tf
+++ b/examples/pubsub/organization/main.tf
@@ -20,8 +20,8 @@ provider "google" {
 
 resource "random_string" "suffix" {
   length  = 4
-  upper   = "false"
-  special = "false"
+  upper   = false
+  special = false
 }
 
 module "log_export" {
@@ -31,7 +31,7 @@ module "log_export" {
   log_sink_name          = "pubsub_org_${random_string.suffix.result}"
   parent_resource_id     = var.parent_resource_id
   parent_resource_type   = "organization"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
@@ -39,6 +39,6 @@ module "destination" {
   project_id               = var.project_id
   topic_name               = "pubsub-org-${random_string.suffix.result}"
   log_sink_writer_identity = module.log_export.writer_identity
-  create_subscriber        = "true"
+  create_subscriber        = true
 }
 
diff --git a/examples/pubsub/organization/variables.tf b/examples/pubsub/organization/variables.tf
index e7e6e19f..32551430 100644
--- a/examples/pubsub/organization/variables.tf
+++ b/examples/pubsub/organization/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which pubsub topic destination will be created."
+  type        = string
 }
 
diff --git a/examples/pubsub/project/main.tf b/examples/pubsub/project/main.tf
index 11c6849f..be8291cc 100644
--- a/examples/pubsub/project/main.tf
+++ b/examples/pubsub/project/main.tf
@@ -20,8 +20,8 @@ provider "google" {
 
 resource "random_string" "suffix" {
   length  = 4
-  upper   = "false"
-  special = "false"
+  upper   = false
+  special = false
 }
 
 module "log_export" {
@@ -31,7 +31,7 @@ module "log_export" {
   log_sink_name          = "pubsub_project_${random_string.suffix.result}"
   parent_resource_id     = var.parent_resource_id
   parent_resource_type   = "project"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
@@ -39,6 +39,6 @@ module "destination" {
   project_id               = var.project_id
   topic_name               = "pubsub-project-${random_string.suffix.result}"
   log_sink_writer_identity = module.log_export.writer_identity
-  create_subscriber        = "true"
+  create_subscriber        = true
 }
 
diff --git a/examples/pubsub/project/variables.tf b/examples/pubsub/project/variables.tf
index e7e6e19f..32551430 100644
--- a/examples/pubsub/project/variables.tf
+++ b/examples/pubsub/project/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which pubsub topic destination will be created."
+  type        = string
 }
 
diff --git a/examples/splunk-sink/main.tf b/examples/splunk-sink/main.tf
index 35320265..b0eea09f 100644
--- a/examples/splunk-sink/main.tf
+++ b/examples/splunk-sink/main.tf
@@ -31,6 +31,6 @@ module "destination" {
   project_id               = var.project_id
   topic_name               = "splunk-sink"
   log_sink_writer_identity = module.log_export.writer_identity
-  create_subscriber        = "true"
+  create_subscriber        = true
 }
 
diff --git a/examples/splunk-sink/variables.tf b/examples/splunk-sink/variables.tf
index e7e6e19f..32551430 100644
--- a/examples/splunk-sink/variables.tf
+++ b/examples/splunk-sink/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which pubsub topic destination will be created."
+  type        = string
 }
 
diff --git a/examples/storage/billing_account/main.tf b/examples/storage/billing_account/main.tf
index b90fb6d7..1f45c788 100644
--- a/examples/storage/billing_account/main.tf
+++ b/examples/storage/billing_account/main.tf
@@ -24,7 +24,7 @@ module "log_export" {
   log_sink_name          = "storage_example_logsink"
   parent_resource_id     = var.parent_resource_id
   parent_resource_type   = "billing_account"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
diff --git a/examples/storage/billing_account/variables.tf b/examples/storage/billing_account/variables.tf
index cbfb9f52..4e969d3a 100644
--- a/examples/storage/billing_account/variables.tf
+++ b/examples/storage/billing_account/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which storage bucket destination will be created."
+  type        = string
 }
 
diff --git a/examples/storage/folder/main.tf b/examples/storage/folder/main.tf
index dad89120..635ef450 100644
--- a/examples/storage/folder/main.tf
+++ b/examples/storage/folder/main.tf
@@ -20,8 +20,8 @@ provider "google" {
 
 resource "random_string" "suffix" {
   length  = 4
-  upper   = "false"
-  special = "false"
+  upper   = false
+  special = false
 }
 
 module "log_export" {
@@ -31,7 +31,7 @@ module "log_export" {
   log_sink_name          = "storage_folder_${random_string.suffix.result}"
   parent_resource_id     = var.parent_resource_id
   parent_resource_type   = "folder"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
diff --git a/examples/storage/folder/variables.tf b/examples/storage/folder/variables.tf
index cbfb9f52..4e969d3a 100644
--- a/examples/storage/folder/variables.tf
+++ b/examples/storage/folder/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which storage bucket destination will be created."
+  type        = string
 }
 
diff --git a/examples/storage/organization/main.tf b/examples/storage/organization/main.tf
index 025b1096..235cbad2 100644
--- a/examples/storage/organization/main.tf
+++ b/examples/storage/organization/main.tf
@@ -20,8 +20,8 @@ provider "google" {
 
 resource "random_string" "suffix" {
   length  = 4
-  upper   = "false"
-  special = "false"
+  upper   = false
+  special = false
 }
 
 module "log_export" {
@@ -31,7 +31,7 @@ module "log_export" {
   log_sink_name          = "storage_org_${random_string.suffix.result}"
   parent_resource_id     = var.parent_resource_id
   parent_resource_type   = "organization"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
diff --git a/examples/storage/organization/variables.tf b/examples/storage/organization/variables.tf
index cbfb9f52..4e969d3a 100644
--- a/examples/storage/organization/variables.tf
+++ b/examples/storage/organization/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which storage bucket destination will be created."
+  type        = string
 }
 
diff --git a/examples/storage/project/main.tf b/examples/storage/project/main.tf
index 89bdaa6f..b99843c0 100644
--- a/examples/storage/project/main.tf
+++ b/examples/storage/project/main.tf
@@ -20,8 +20,8 @@ provider "google" {
 
 resource "random_string" "suffix" {
   length  = 4
-  upper   = "false"
-  special = "false"
+  upper   = false
+  special = false
 }
 
 module "log_export" {
@@ -31,7 +31,7 @@ module "log_export" {
   log_sink_name          = "storage_project_${random_string.suffix.result}"
   parent_resource_id     = var.parent_resource_id
   parent_resource_type   = "project"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
diff --git a/examples/storage/project/variables.tf b/examples/storage/project/variables.tf
index cbfb9f52..4e969d3a 100644
--- a/examples/storage/project/variables.tf
+++ b/examples/storage/project/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the project in which storage bucket destination will be created."
+  type        = string
 }
 
diff --git a/modules/bigquery/README.md b/modules/bigquery/README.md
index 70dbe15c..62bfa4f2 100644
--- a/modules/bigquery/README.md
+++ b/modules/bigquery/README.md
@@ -16,7 +16,7 @@ module "log_export" {
   log_sink_name          = "bigquery_example_logsink"
   parent_resource_id     = "sample-project"
   parent_resource_type   = "project"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
@@ -38,7 +38,7 @@ so that all dependencies are met.
 |------|-------------|:----:|:-----:|:-----:|
 | dataset\_name | The name of the bigquery dataset to be created and used for log entries matching the filter. | string | n/a | yes |
 | default\_table\_expiration\_ms | Default table expiration time (in ms) | string | `"3600000"` | no |
-| delete\_contents\_on\_destroy | (Optional) If set to true, delete all the tables in the dataset when destroying the resource; otherwise, destroying the resource will fail if tables are present. | string | `"true"` | no |
+| delete\_contents\_on\_destroy | (Optional) If set to true, delete all the tables in the dataset when destroying the resource; otherwise, destroying the resource will fail if tables are present. | bool | `"true"` | no |
 | description | A use-friendly description of the dataset | string | `"Log export dataset"` | no |
 | labels | Dataset labels | map | `<map>` | no |
 | location | The location of the storage bucket. | string | `"US"` | no |
diff --git a/modules/bigquery/variables.tf b/modules/bigquery/variables.tf
index 8b1b372f..5a879376 100644
--- a/modules/bigquery/variables.tf
+++ b/modules/bigquery/variables.tf
@@ -16,38 +16,45 @@
 
 variable "dataset_name" {
   description = "The name of the bigquery dataset to be created and used for log entries matching the filter."
+  type        = string
 }
 
 variable "log_sink_writer_identity" {
   description = "The service account that logging uses to write log entries to the destination. (This is available as an output coming from the root module)."
+  type        = string
 }
 
 variable "project_id" {
   description = "The ID of the project in which the bigquery dataset will be created."
+  type        = string
 }
 
 variable "location" {
   description = "The location of the storage bucket."
+  type        = string
   default     = "US"
 }
 
 variable "delete_contents_on_destroy" {
   description = "(Optional) If set to true, delete all the tables in the dataset when destroying the resource; otherwise, destroying the resource will fail if tables are present."
-  default     = "true"
+  type        = bool
+  default     = true
 }
 
 variable "default_table_expiration_ms" {
   description = "Default table expiration time (in ms)"
+  type        = number
   default     = 3600000
 }
 
 variable "description" {
   description = "A use-friendly description of the dataset"
+  type        = string
   default     = "Log export dataset"
 }
 
 variable "labels" {
   description = "Dataset labels"
-  type        = map
+  type        = map(string)
   default     = {}
 }
diff --git a/modules/pubsub/README.md b/modules/pubsub/README.md
index fb06025f..60e67648 100644
--- a/modules/pubsub/README.md
+++ b/modules/pubsub/README.md
@@ -16,7 +16,7 @@ module "log_export" {
   log_sink_name          = "pubsub_example_logsink"
   parent_resource_id     = "sample-project"
   parent_resource_type   = "project"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
@@ -24,7 +24,7 @@ module "destination" {
   project_id               = "sample-project"
   topic_name               = "sample-topic"
   log_sink_writer_identity = "${module.log_export.writer_identity}"
-  create_subscriber        = "true"
+  create_subscriber        = true
 }
 ```
 
@@ -37,7 +37,7 @@ so that all dependencies are met.
 
 | Name | Description | Type | Default | Required |
 |------|-------------|:----:|:-----:|:-----:|
-| create\_subscriber | Whether to create a subscription to the topic that was created and used for log entries matching the filter. If 'true', a subscription is created along with a service account that is granted roles/pubsub.subscriber and roles/pubsub.viewer to the topic. | string | `"false"` | no |
+| create\_subscriber | Whether to create a subscription to the topic that was created and used for log entries matching the filter. If 'true', a subscription is created along with a service account that is granted roles/pubsub.subscriber and roles/pubsub.viewer to the topic. | bool | `"false"` | no |
 | log\_sink\_writer\_identity | The service account that logging uses to write log entries to the destination. (This is available as an output coming from the root module). | string | n/a | yes |
 | project\_id | The ID of the project in which the pubsub topic will be created. | string | n/a | yes |
 | topic\_labels | A set of key/value label pairs to assign to the pubsub topic. | map(string) | `<map>` | no |
diff --git a/modules/pubsub/variables.tf b/modules/pubsub/variables.tf
index 60ec01be..d1792d06 100644
--- a/modules/pubsub/variables.tf
+++ b/modules/pubsub/variables.tf
@@ -16,19 +16,23 @@
 
 variable "create_subscriber" {
   description = "Whether to create a subscription to the topic that was created and used for log entries matching the filter. If 'true', a subscription is created along with a service account that is granted roles/pubsub.subscriber and roles/pubsub.viewer to the topic."
-  default     = "false"
+  type        = bool
+  default     = false
 }
 
 variable "log_sink_writer_identity" {
   description = "The service account that logging uses to write log entries to the destination. (This is available as an output coming from the root module)."
+  type        = string
 }
 
 variable "project_id" {
   description = "The ID of the project in which the pubsub topic will be created."
+  type        = string
 }
 
 variable "topic_name" {
   description = "The name of the pubsub topic to be created and used for log entries matching the filter."
+  type        = string
 }
 
 variable "topic_labels" {
diff --git a/modules/storage/README.md b/modules/storage/README.md
index 9747af12..d5bf711e 100644
--- a/modules/storage/README.md
+++ b/modules/storage/README.md
@@ -16,7 +16,7 @@ module "log_export" {
   log_sink_name          = "storage_example_logsink"
   parent_resource_id     = "sample-project"
   parent_resource_type   = "project"
-  unique_writer_identity = "true"
+  unique_writer_identity = true
 }
 
 module "destination" {
diff --git a/modules/storage/variables.tf b/modules/storage/variables.tf
index 3cbfb770..1a859e29 100644
--- a/modules/storage/variables.tf
+++ b/modules/storage/variables.tf
@@ -16,23 +16,28 @@
 
 variable "log_sink_writer_identity" {
   description = "The service account that logging uses to write log entries to the destination. (This is available as an output coming from the root module)."
+  type        = string
 }
 
 variable "project_id" {
   description = "The ID of the project in which the storage bucket will be created."
+  type        = string
 }
 
 variable "storage_bucket_name" {
   description = "The name of the storage bucket to be created and used for log entries matching the filter."
+  type        = string
 }
 
 variable "location" {
   description = "The location of the storage bucket."
+  type        = string
   default     = "US"
 }
 
 variable "storage_class" {
   description = "The storage class of the storage bucket."
+  type        = string
   default     = "MULTI_REGIONAL"
 }
 
diff --git a/test/fixtures/bigquery/folder/variables.tf b/test/fixtures/bigquery/folder/variables.tf
index eb4aa857..00d7d733 100644
--- a/test/fixtures/bigquery/folder/variables.tf
+++ b/test/fixtures/bigquery/folder/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_folder" {
   description = "The ID of the parent resource folder in which the destination will be created."
+  type        = string
 }
 
diff --git a/test/fixtures/bigquery/organization/variables.tf b/test/fixtures/bigquery/organization/variables.tf
index a2962e4f..271d98a9 100644
--- a/test/fixtures/bigquery/organization/variables.tf
+++ b/test/fixtures/bigquery/organization/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_organization" {
   description = "The ID of the parent resource organization in which the destination will be created."
+  type        = string
 }
 
diff --git a/test/fixtures/bigquery/project/variables.tf b/test/fixtures/bigquery/project/variables.tf
index b661cd52..77cb3812 100644
--- a/test/fixtures/bigquery/project/variables.tf
+++ b/test/fixtures/bigquery/project/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_project" {
   description = "The ID of the parent resource project in which the destination will be created."
+  type        = string
 }
 
diff --git a/test/fixtures/computed_values/main.tf b/test/fixtures/computed_values/main.tf
index 06addbb2..7ca92346 100644
--- a/test/fixtures/computed_values/main.tf
+++ b/test/fixtures/computed_values/main.tf
@@ -16,8 +16,8 @@
 
 resource "random_string" "suffix" {
   length  = 4
-  upper   = "false"
-  special = "false"
+  upper   = false
+  special = false
 }
 
 resource "google_project" "computed" {
diff --git a/test/fixtures/computed_values/variables.tf b/test/fixtures/computed_values/variables.tf
index 097b4578..7bdfd01f 100644
--- a/test/fixtures/computed_values/variables.tf
+++ b/test/fixtures/computed_values/variables.tf
@@ -16,13 +16,16 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_folder" {
   description = "The ID of the parent resource folder in which the destination and the test project will be created."
+  type        = string
 }
 
 variable "parent_resource_billing_account" {
   description = "The ID of the billing account in which the test project will be created."
+  type        = string
 }
 
diff --git a/test/fixtures/pubsub/folder/variables.tf b/test/fixtures/pubsub/folder/variables.tf
index eb4aa857..00d7d733 100644
--- a/test/fixtures/pubsub/folder/variables.tf
+++ b/test/fixtures/pubsub/folder/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_folder" {
   description = "The ID of the parent resource folder in which the destination will be created."
+  type        = string
 }
 
diff --git a/test/fixtures/pubsub/organization/variables.tf b/test/fixtures/pubsub/organization/variables.tf
index a2962e4f..271d98a9 100644
--- a/test/fixtures/pubsub/organization/variables.tf
+++ b/test/fixtures/pubsub/organization/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_organization" {
   description = "The ID of the parent resource organization in which the destination will be created."
+  type        = string
 }
 
diff --git a/test/fixtures/pubsub/project/variables.tf b/test/fixtures/pubsub/project/variables.tf
index b661cd52..77cb3812 100644
--- a/test/fixtures/pubsub/project/variables.tf
+++ b/test/fixtures/pubsub/project/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_project" {
   description = "The ID of the parent resource project in which the destination will be created."
+  type        = string
 }
 
diff --git a/test/fixtures/storage/folder/variables.tf b/test/fixtures/storage/folder/variables.tf
index eb4aa857..00d7d733 100644
--- a/test/fixtures/storage/folder/variables.tf
+++ b/test/fixtures/storage/folder/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_folder" {
   description = "The ID of the parent resource folder in which the destination will be created."
+  type        = string
 }
 
diff --git a/test/fixtures/storage/organization/variables.tf b/test/fixtures/storage/organization/variables.tf
index a2962e4f..271d98a9 100644
--- a/test/fixtures/storage/organization/variables.tf
+++ b/test/fixtures/storage/organization/variables.tf
@@ -16,9 +16,11 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_organization" {
   description = "The ID of the parent resource organization in which the destination will be created."
+  type        = string
 }
 
diff --git a/test/fixtures/storage/project/variables.tf b/test/fixtures/storage/project/variables.tf
index 7c8ba273..265bc18b 100644
--- a/test/fixtures/storage/project/variables.tf
+++ b/test/fixtures/storage/project/variables.tf
@@ -16,8 +16,10 @@
 
 variable "project_id" {
   description = "The ID of the project in which the log export will be created."
+  type        = string
 }
 
 variable "parent_resource_project" {
   description = "The ID of the parent resource project in which the destination will be created."
+  type        = string
 }
diff --git a/variables.tf b/variables.tf
index 9885166e..ace9002b 100644
--- a/variables.tf
+++ b/variables.tf
@@ -16,32 +16,39 @@
 
 variable "destination_uri" {
   description = "The self_link URI of the destination resource (This is available as an output coming from one of the destination submodules)"
+  type        = string
 }
 
 variable "filter" {
   description = "The filter to apply when exporting logs. Only log entries that match the filter are exported. Default is '' which exports all logs."
+  type        = string
   default     = ""
 }
 
 variable "include_children" {
   description = "Only valid if 'organization' or 'folder' is chosen as var.parent_resource.type. Determines whether or not to include children organizations/folders in the sink export. If true, logs associated with child projects are also exported; otherwise only logs relating to the provided organization/folder are included."
-  default     = "false"
+  type        = bool
+  default     = false
 }
 
 variable "log_sink_name" {
   description = "The name of the log sink to be created."
+  type        = string
 }
 
 variable "parent_resource_id" {
   description = "The ID of the GCP resource in which you create the log sink. If var.parent_resource_type is set to 'project', then this is the Project ID (and etc)."
+  type        = string
 }
 
 variable "parent_resource_type" {
   description = "The GCP resource in which you create the log sink. The value must not be computed, and must be one of the following: 'project', 'folder', 'billing_account', or 'organization'."
+  type        = string
   default     = "project"
 }
 
 variable "unique_writer_identity" {
   description = "Whether or not to create a unique identity associated with this sink. If false (the default), then the writer_identity used is serviceAccount:cloud-logs@system.gserviceaccount.com. If true, then a unique service account is created and used for the logging sink."
-  default     = "false"
+  type        = bool
+  default     = false
 }