diff --git a/Project.toml b/Project.toml
index 111d733..ec4986f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,11 +1,10 @@
 name = "ACTRModels"
 uuid = "c095b0ea-a6ca-5cbd-afed-dbab2e976880"
 authors = ["itsdfish"]
-version = "0.8.0"
+version = "0.8.1"
 
 [deps]
 ConcreteStructs = "2569d6c7-a4a2-43d3-a901-331e8e4be471"
-DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
 Distributions = "31c24e10-a181-5473-b8eb-7969acd0382f"
 Parameters = "d96e819e-fc66-5662-9728-84c9c7592b0a"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
@@ -20,7 +19,6 @@ Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
 ConcreteStructs = "v0.2.0"
-DataFrames = "0.22.0, 1.0"
 Distributions = "^0.22.0, 0.23, 0.24, 0.25"
 Parameters = "^0.12.0"
 PrettyTables = "1.1.0"
diff --git a/src/MemoryFunctions.jl b/src/MemoryFunctions.jl
index ad2f6e1..2f821a0 100644
--- a/src/MemoryFunctions.jl
+++ b/src/MemoryFunctions.jl
@@ -916,6 +916,25 @@ function get_parm(actr, p)
     return getfield(actr.parms, p)
 end
 
+"""
+    blend_chunks(actr; request...) 
+
+Computes blended value over chunks given a retrieval request. By default, 
+values are blended over the set of slots formed by the set difference between all 
+slots of a chunk and the slots specified in the retrieval request. The default time used 
+in activation calculations is taken from `get_time`. Currently, blended 
+is only supported for numeric slot-values. 
+
+# Arguments
+
+- `actr::AbstractACTR`: an `ACTR` model object 
+- `request...`: optional keywords for the retrieval request
+"""
+function blend_chunks(actr; request...) 
+    t = get_time(actr)
+    return blend_chunks(actr, t; request...) 
+end
+
 """
     blend_chunks(actr, cur_time::Float64=0.0; request...) 
 
@@ -926,15 +945,52 @@ is only supported for numeric slot-values.
 
 # Arguments
 
-- `actr`: an `ACTR` model object 
-- `cur_time::Float64=0.0`: current simulated time
+- `actr::AbstractACTR`: an `ACTR` model object 
+- `cur_time::Float64`: current simulated time
 - `request...`: optional keywords for the retrieval request
 """
-function blend_chunks(actr, cur_time::Float64=0.0; request...) 
+function blend_chunks(actr::AbstractACTR, cur_time::Float64; request...) 
     blended_slots = setdiff(keys(actr.declarative.memory[1].slots), keys(request))
     return blend_chunks(actr, blended_slots, cur_time; request...)
 end
 
+"""
+    blend_chunks(actr; request...) 
+
+Computes blended value over chunks given a retrieval request. By default, 
+values are blended over the set of slots formed by the set difference between all 
+slots of a chunk and the slots specified in the retrieval request. The default time used 
+in activation calculations is taken from `get_time`. Currently, blended 
+is only supported for numeric slot-values. 
+
+# Arguments
+
+- `actr::AbstractACTR`: an `ACTR` model object 
+- `request...`: optional keywords for the retrieval request
+"""
+function blend_chunks(actr::AbstractACTR; request...) 
+    return blend_chunks(actr, get_time(actr); request...) 
+end
+
+"""
+    blend_chunks(actr; request...) 
+
+Computes blended value over chunks given a retrieval request. By default, 
+values are blended over the set of slots formed by the set difference between all 
+slots of a chunk and the slots specified in the retrieval request. The default time used 
+in activation calculations is taken from `get_time(actr`). Currently, blended 
+is only supported for numeric slot-values. 
+
+# Arguments
+
+- `actr::AbstractACTR`: an `ACTR` model object 
+- `blended_slots`: a set of slots over which slot-values are blended
+- `request...`: optional keywords for the retrieval request
+"""
+function blend_chunks(actr::AbstractACTR, blended_slots; request...) 
+    return blend_chunks(actr, blended_slots, get_time(actr); request...) 
+end
+
 """
     blend_chunks(actr, cur_time::Float64=0.0; request...) 
 
@@ -946,10 +1002,10 @@ for numeric slot-values.
 
 - `actr`: an `ACTR` model object 
 - `blended_slots`: a set of slots over which slot-values are blended
-- `cur_time::Float64=0.0`: current simulated time
+- `cur_time`: current simulated time
 - `request...`: optional keywords for the retrieval request
 """
-function blend_chunks(actr, blended_slots, cur_time=0.0; request...)
+function blend_chunks(actr, blended_slots, cur_time; request...)
     chunks = retrieval_request(actr; request...)
     compute_activation!(actr, chunks, cur_time; request...)
     probs = soft_max(actr, chunks)
diff --git a/src/Structs.jl b/src/Structs.jl
index 160ebf1..d13f454 100644
--- a/src/Structs.jl
+++ b/src/Structs.jl
@@ -355,7 +355,6 @@ function Imaginal(;buffer=Chunk[], ω=1.0, denoms=Int64[])
     Imaginal(buffer, state, ω, denoms)
 end
 
-
 Imaginal(chunk::Chunk, state, ω, denoms) = Imaginal([chunk], state, ω, denoms)
 Imaginal(T::DataType, state, ω, denoms) = Imaginal(T(undef,1), state, ω, denoms)
 
@@ -584,6 +583,12 @@ function Motor(T::DataType, state, mouse_position)
     Motor(T(undef,1), state, mouse_position)
 end
 
+mutable struct Scheduler
+    time::Float64
+end
+
+Scheduler(;time=0.0) = Scheduler(time)
+
 abstract type AbstractACTR end
 
 """
@@ -626,7 +631,7 @@ end
 Broadcast.broadcastable(x::ACTR) = Ref(x)
 
 function ACTR(;declarative=Declarative(), imaginal=Imaginal(), 
-    goal = Goal(), scheduler=nothing, visual=nothing, visual_location=nothing, 
+    goal = Goal(), scheduler=Scheduler(), visual=nothing, visual_location=nothing, 
     procedural=nothing, motor=nothing, visicon=init_visicon(), parms...) 
     parms′ = Parms(;parms...)
     ACTR(declarative, imaginal, visual, visual_location, goal, procedural, motor, visicon, parms′, scheduler)
diff --git a/src/Utilities/Utilities.jl b/src/Utilities/Utilities.jl
index a6fa0dd..1cc9a8a 100644
--- a/src/Utilities/Utilities.jl
+++ b/src/Utilities/Utilities.jl
@@ -317,15 +317,12 @@ function get_mean_activations(chunks::Vector{<:Chunk})
 end
 
 get_time(actr::AbstractACTR) = get_time(actr.scheduler)
-get_time(scheduler::Float64) = scheduler
 get_time(scheduler) = scheduler.time 
 
 add_time(actr::AbstractACTR, t) = add_time(actr.scheduler, t)
-add_time(scheduler::Float64, t) = scheduler += t
-add_time(scheduler) = scheduler.time += t
+add_time(scheduler, t) = scheduler.time += t
 
 reset_time!(actr::AbstractACTR) = reset_time!(actr.scheduler)
-reset_time!(scheduler::Float64) = scheduler = 0.0
 reset_time!(scheduler) = scheduler.time = 0.0
 
 rnd_time(μ) = rand(Uniform(μ * (2/3), μ * (4/3)))
\ No newline at end of file