diff --git a/Metadata-standard-names.md b/Metadata-standard-names.md
index 1d7cab8..17540bf 100644
--- a/Metadata-standard-names.md
+++ b/Metadata-standard-names.md
@@ -385,7 +385,7 @@ Variables defining or relating to timing, dates, calendar, and related concepts
     * `real`: units = h
 * `index_of_timestep`: Index of timestep
     * `integer`: units = index
-* `is_first_timestep`: Is first timestep
+* `is_first_timestep`: Indicates whether the current timestep is the first timestep
     * `logical`: units = flag
 * `number_of_days_in_current_year`: Number of days in current year
     * `integer`: units = days
@@ -1099,12 +1099,12 @@ Variables related to the compute environment, properties of variables, input/out
     * `character`: units = none
 * `filename_of_rrtmgp_shortwave_k_distribution`: File name of Rapid Radiative Transfer Model for General circulation model applications - Parallel (RRTMGP) shortwave k-distribution
     * `character`: units = none
-* `flag_for_mpi_root`: Flag for MPI root process
-    * `logical`: units = flag
 * `iounit_of_log`: Iounit of log
     * `integer`: units = 1
 * `iounit_of_namelist`: Iounit of namelist
     * `integer`: units = 1
+* `is_mpi_root`: Flag for MPI root process
+    * `logical`: units = flag
 * `log_output_unit`: Fortran logical unit for output log file
     * `integer`: units = 1
 * `map_of_block_column_number_to_global_i_index`: Map of block column number to global i index
@@ -1303,8 +1303,6 @@ Variables that indicate or control some action.
     * `integer`: units = 1
 * `control_for_vertical_index_direction`: control flag for direction of vertical index; 0 indicates index from toa to surface, 1 indicates index from surface to toa
     * `integer`: units = 1
-* `disable_precipitation_radiative_effect`: Disable precipitation radiative effect
-    * `logical`: units = flag
 * `do_aerosol_physics`: Do aerosol physics
     * `logical`: units = flag
 * `do_allow_supersaturation_after_sedimentation`: Do allow supersaturation after sedimentation
@@ -1347,6 +1345,8 @@ Variables that indicate or control some action.
     * `logical`: units = flag
 * `do_diagnostics`: Do diagnostics
     * `logical`: units = flag
+* `do_disable_precipitation_radiative_effect`: Do disable precipitation radiative effect
+    * `logical`: units = flag
 * `do_dominant_precipitation_type_partition`: Do dominant precipitation type partition
     * `logical`: units = flag
 * `do_flip`: Flag indicating whether to flip vertical coordinate
@@ -1609,7 +1609,7 @@ Variables that indicate or control some action.
     * `integer`: units = 1
 * `identifier_for_zhao_carr_pdf_microphysics_scheme`: Identifier for Zhao-Carr probability density function microphysics scheme
     * `integer`: units = 1
-* `is_restart`: Is restart
+* `is_restart`: Flag indicating whether or not this is a restart run
     * `logical`: units = flag
 ## Indices
 Values indicating the index of some array or other data structure
diff --git a/Metadata-standard-names.yaml b/Metadata-standard-names.yaml
index 72cff48..8b5152c 100644
--- a/Metadata-standard-names.yaml
+++ b/Metadata-standard-names.yaml
@@ -732,7 +732,7 @@ section:
     type: integer
     units: index
   - name: is_first_timestep
-    description: Is first timestep
+    description: Indicates whether the current timestep is the first timestep
     type: logical
     units: flag
   - name: number_of_days_in_current_year
@@ -2221,10 +2221,6 @@ section:
       model applications - Parallel (RRTMGP) shortwave k-distribution
     type: character
     units: none
-  - name: flag_for_mpi_root
-    description: Flag for MPI root process
-    type: logical
-    units: flag
   - name: iounit_of_log
     description: Iounit of log
     type: integer
@@ -2233,6 +2229,10 @@ section:
     description: Iounit of namelist
     type: integer
     units: 1
+  - name: is_mpi_root
+    description: Flag for MPI root process
+    type: logical
+    units: flag
   - name: log_output_unit
     description: Fortran logical unit for output log file
     type: integer
@@ -2642,10 +2642,6 @@ section:
       toa to surface, 1 indicates index from surface to toa
     type: integer
     units: 1
-  - name: disable_precipitation_radiative_effect
-    description: Disable precipitation radiative effect
-    type: logical
-    units: flag
   - name: do_aerosol_physics
     description: Do aerosol physics
     type: logical
@@ -2730,6 +2726,10 @@ section:
     description: Do diagnostics
     type: logical
     units: flag
+  - name: do_disable_precipitation_radiative_effect
+    description: Do disable precipitation radiative effect
+    type: logical
+    units: flag
   - name: do_dominant_precipitation_type_partition
     description: Do dominant precipitation type partition
     type: logical
@@ -3280,7 +3280,7 @@ section:
     type: integer
     units: 1
   - name: is_restart
-    description: Is restart
+    description: Flag indicating whether or not this is a restart run
     type: logical
     units: flag
 - name: Indices
diff --git a/StandardNamesRules.rst b/StandardNamesRules.rst
index 9212b6a..6a1373f 100644
--- a/StandardNamesRules.rst
+++ b/StandardNamesRules.rst
@@ -195,9 +195,29 @@ Terminology
    relevant, the net ionization charge should be included as a prefix (in words, because +/- are
    not valid standard name characters); e.g. ``number_density_of_plus_1_ionized_he``
 
-#. For control-oriented variables, if the variable is a Fortran logical,
-   use flag_for ``_X``. If it is any other data type, use control_for ``_X``. All flags
-   should be Fortran logicals.
+#. For control-oriented variables, there are a few different prefixes that should be used depending on
+   the use case for that specific variable:
+
+   +-------------------+-----------+-----------------------------------------------------------------------------------------------+
+   | **Prefix**        |  **Type** | **Use case**                    | **Example**                                                 |
+   +===================+===========+=================================+=============================================================+
+   | `is_`             | `logical` | A flag indicating some state or | `is_mpi_root` indicates whether or not the code is running  |
+   |                   |           | condition is true or false      | on the MPI root process                                     |
+   +-------------------+-----------+-------------------------------- +-------------------------------------------------------------+
+   | `do_`             | `logical` | A flag whose value directs some | `do_chemical_tracer_diagnostics` indicates to a physics     |
+   |                   |           | behavior                        | scheme that it should compute chemical tracer diagnostics   |
+   +-------------------+-----------+---------------------------------+-------------------------------------------------------------+
+   | `identifier_for_` | `integer` | A parameter indicating some     | `identifier_for_noah_land_surface_scheme` is an integer     |
+   |                   |           | state or condition              | identifying the Noah land surface model                     |
+   +-------------------+-----------+---------------------------------+-------------------------------------------------------------+
+   | `control_for_`    | `integer` | A control whose value directs   | `control_for_land_surface_scheme` is an integer identifying |
+   |                   |           | some behavior                   | the land surface scheme type                                |
+   +-------------------+-----------+---------------------------------+-------------------------------------------------------------+
+   | `index_of_`       | `integer` | An index entry for an array     | `index_of_ice_vegetation_category` is an index describing   |
+   |                   |           |                                 | the location of the ice vegetation category in the array of |
+   |                   |           |                                 | vegetation categories                                       |
+   +-------------------+-----------+---------------------------------+-------------------------------------------------------------+
+
 
 #. **Disallowed terms:** A few terms are disallowed as standard name components for various reasons; mostly due to
    ambiguity.
@@ -435,7 +455,9 @@ Prefixes
 | upper_bound_of
 | unfiltered
 | nonnegative
-| flag_for
+| is
+| do
+| identifier_for
 | control_for
 | number_of
 | index_of
@@ -458,7 +480,6 @@ Infixes
 ^^^^^^^
 
 | directory_for ``_X`` _source_code
-| flag_for_reading ``_X`` _from_input
 
 Suffixes
 ^^^^^^^^
diff --git a/standard_names.xml b/standard_names.xml
index c3a41db..9fbb94e 100644
--- a/standard_names.xml
+++ b/standard_names.xml
@@ -544,7 +544,7 @@
     <standard_name name="index_of_timestep">
       <type units="index">integer</type>
     </standard_name>
-    <standard_name name="is_first_timestep">
+    <standard_name name="is_first_timestep" description="Indicates whether the current timestep is the first timestep">
       <type units="flag">logical</type>
     </standard_name>
     <standard_name name="number_of_days_in_current_year">
@@ -1596,15 +1596,15 @@
     <standard_name name="filename_of_rrtmgp_shortwave_k_distribution" description="File name of Rapid Radiative Transfer Model for General circulation model applications - Parallel (RRTMGP) shortwave k-distribution">
       <type units="none">character</type>
     </standard_name>
-    <standard_name name="flag_for_mpi_root" description="Flag for MPI root process">
-      <type units="flag">logical</type>
-    </standard_name>
     <standard_name name="iounit_of_log">
       <type units="1">integer</type>
     </standard_name>
     <standard_name name="iounit_of_namelist">
       <type units="1">integer</type>
     </standard_name>
+    <standard_name name="is_mpi_root" description="Flag for MPI root process">
+      <type units="flag">logical</type>
+    </standard_name>
     <standard_name name="log_output_unit" description="Fortran logical unit for output log file">
       <type units="1">integer</type>
     </standard_name>
@@ -1901,9 +1901,6 @@
     <standard_name name="control_for_vertical_index_direction" description="control flag for direction of vertical index; 0 indicates index from toa to surface, 1 indicates index from surface to toa">
       <type units="1">integer</type>
     </standard_name>
-    <standard_name name="disable_precipitation_radiative_effect">
-      <type units="flag">logical</type>
-    </standard_name>
     <standard_name name="do_aerosol_physics">
       <type units="flag">logical</type>
     </standard_name>
@@ -1967,6 +1964,9 @@
     <standard_name name="do_diagnostics">
       <type units="flag">logical</type>
     </standard_name>
+    <standard_name name="do_disable_precipitation_radiative_effect">
+      <type units="flag">logical</type>
+    </standard_name>
     <standard_name name="do_dominant_precipitation_type_partition">
       <type units="flag">logical</type>
     </standard_name>
@@ -2360,7 +2360,7 @@
     <standard_name name="identifier_for_zhao_carr_pdf_microphysics_scheme" description="Identifier for Zhao-Carr probability density function microphysics scheme">
       <type units="1">integer</type>
     </standard_name>
-    <standard_name name="is_restart">
+    <standard_name name="is_restart" description="Flag indicating whether or not this is a restart run">
       <type units="flag">logical</type>
     </standard_name>
   </section>