diff --git a/R/CreateCalibOptions.R b/R/CreateCalibOptions.R
index 7142a5a852884810a862d8099efa5ec48c089e79..b45ceec44de088edaf8fad1f81a4327ee4b6cd26 100644
--- a/R/CreateCalibOptions.R
+++ b/R/CreateCalibOptions.R
@@ -21,7 +21,6 @@ CreateCalibOptions <- function(FUN_MOD,FUN_CALIB=Calibration_Michel,FUN_TRANSFO=
   ##check_FUN_CALIB
     BOOL <- FALSE;
     if(identical(FUN_CALIB,Calibration_Michel)){ ObjectClass <- c(ObjectClass,"HBAN"  ); BOOL <- TRUE; }
-    if(identical(FUN_CALIB,Calibration_optim )){ ObjectClass <- c(ObjectClass,"optim" ); BOOL <- TRUE; }
     if(!BOOL){ stop("incorrect FUN_CALIB for use in CreateCalibOptions \n"); return(NULL); } 
 
   ##check_FUN_TRANSFO
@@ -102,8 +101,7 @@ CreateCalibOptions <- function(FUN_MOD,FUN_CALIB=Calibration_Michel,FUN_TRANSFO=
     }
 
   ##check_StartParamList_and_StartParamDistrib__default_values
-    if( ("HBAN"  %in% ObjectClass & is.null(StartParamList) & is.null(StartParamDistrib)) |
-        ("optim" %in% ObjectClass & is.null(StartParam)) ){
+    if( ("HBAN"  %in% ObjectClass & is.null(StartParamList) & is.null(StartParamDistrib)) ){
 
       if("GR4H"%in% ObjectClass){ 
         ParamT <- matrix( c( +5.12, -1.18, +4.34, -9.69,
@@ -164,12 +162,6 @@ CreateCalibOptions <- function(FUN_MOD,FUN_CALIB=Calibration_Michel,FUN_TRANSFO=
       if(sum(is.na(StartParamDistrib[1,]))!=0){ stop("StartParamDistrib must not include NA values on the first line \n"); return(NULL);  }
       if(ncol(StartParamDistrib)!=NParam     ){ stop("Incompatibility between StartParamDistrib ncol and FUN_MOD \n"); return(NULL);  }
     }
-    if("optim" %in% ObjectClass & !is.null(StartParam)){
-      if(!is.vector( StartParam)    ){ stop("StartParam must be a vector \n"); return(NULL);  }
-      if(!is.numeric(StartParam)    ){ stop("StartParam must be a vector of numeric values \n"); return(NULL);  }
-      if(sum(is.na(StartParam))!=0  ){ stop("StartParam must not include NA values \n"); return(NULL);  }
-      if(length(StartParam)!=NParam ){ stop("Incompatibility between StartParam length and FUN_MOD \n"); return(NULL);  }
-    }
 
 
   ##Create_CalibOptions
diff --git a/man/Calibration.Rd b/man/Calibration.Rd
index b632ec877b87c59f2e8d744a7108852a37e6e6fc..c889275678a67ac0e345b46e6ac7e187cba8f566 100644
--- a/man/Calibration.Rd
+++ b/man/Calibration.Rd
@@ -22,14 +22,14 @@ Calibration(InputsModel, RunOptions, InputsCrit, CalibOptions, FUN_MOD,
 
 \item{FUN_CRIT}{[function] error criterion function (e.g. ErrorCrit_RMSE, ErrorCrit_NSE)}
 
-\item{FUN_CALIB}{(optional) [function] calibration algorithm function (e.g. Calibration_Michel, Calibration_optim), default=Calibration_Michel}
+\item{FUN_CALIB}{(optional) [function] calibration algorithm function (e.g. Calibration_Michel), default=Calibration_Michel}
 
 \item{FUN_TRANSFO}{(optional) [function] model parameters transformation function, if the FUN_MOD used is native in the package FUN_TRANSFO is automatically defined}
 
 \item{quiet}{(optional) [boolean] boolean indicating if the function is run in quiet mode or not, default=FALSE}
 }
 \value{
-[list] see \code{\link{Calibration_Michel}} or \code{\link{Calibration_optim}}
+[list] see \code{\link{Calibration_Michel}}
 }
 \description{
 Calibration algorithm which optimises the error criterion selected as objective function using the provided functions. \cr
@@ -92,8 +92,8 @@ cat(paste("  Crit  ", OutputsCrit$CritName, "  ",
 Laurent Coron (June 2014)
 }
 \seealso{
-\code{\link{Calibration_Michel}}, \code{\link{Calibration_optim}},
-         \code{\link{RunModel}}, \code{\link{ErrorCrit}}, \code{\link{TransfoParam}},
+\code{\link{Calibration_Michel}},
+         \code{\link{ErrorCrit}}, \code{\link{TransfoParam}},
          \code{\link{CreateInputsModel}}, \code{\link{CreateRunOptions}}, 
          \code{\link{CreateInputsCrit}}, \code{\link{CreateCalibOptions}}.
 }
diff --git a/man/Calibration_Michel.Rd b/man/Calibration_Michel.Rd
index 8a576b1f3fd4dfba55c198279ca81d3d5370282f..24166d656499db9e115f8392219b9938c363811b 100644
--- a/man/Calibration_Michel.Rd
+++ b/man/Calibration_Michel.Rd
@@ -122,7 +122,7 @@ Michel, C. (1991),
        Hydrologie appliquée aux petits bassins ruraux, Hydrology handbook (in French), Cemagref, Antony, France.
 }
 \seealso{
-\code{\link{Calibration}}, \code{\link{Calibration_optim}},
+\code{\link{Calibration}},
          \code{\link{RunModel_GR4J}}, \code{\link{TransfoParam_GR4J}}, \code{\link{ErrorCrit_RMSE}},
          \code{\link{CreateInputsModel}}, \code{\link{CreateRunOptions}}, 
          \code{\link{CreateInputsCrit}}, \code{\link{CreateCalibOptions}}.
diff --git a/man/CreateCalibOptions.Rd b/man/CreateCalibOptions.Rd
index 83b86bf3ad993d92859c67c982f3fd0c097839b4..e545dfaee6416052293669a7398a5ff32dd85422 100644
--- a/man/CreateCalibOptions.Rd
+++ b/man/CreateCalibOptions.Rd
@@ -3,7 +3,7 @@
 \encoding{UTF-8}
 \name{CreateCalibOptions}
 \alias{CreateCalibOptions}
-\title{Creation of the CalibOptions object required bu the Calibration functions}
+\title{Creation of the CalibOptions object required but the Calibration functions}
 \usage{
 CreateCalibOptions(FUN_MOD, FUN_CALIB = Calibration_Michel,
   FUN_TRANSFO = NULL, OptimParam = NULL, FixedParam = NULL,
@@ -13,7 +13,7 @@ CreateCalibOptions(FUN_MOD, FUN_CALIB = Calibration_Michel,
 \arguments{
 \item{FUN_MOD}{[function] hydrological model function (e.g. RunModel_GR4J, RunModel_CemaNeigeGR4J)}
 
-\item{FUN_CALIB}{(optional) [function] calibration algorithm function (e.g. Calibration_Michel, Calibration_optim), default=Calibration_Michel}
+\item{FUN_CALIB}{(optional) [function] calibration algorithm function (e.g. Calibration_Michel), default=Calibration_Michel}
 
 \item{FUN_TRANSFO}{(optional) [function] model parameters transformation function, if the FUN_MOD used is native in the package, FUN_TRANSFO is automatically defined}
 
@@ -29,7 +29,7 @@ CreateCalibOptions(FUN_MOD, FUN_CALIB = Calibration_Michel,
      [2,]     \tab 3000   \tab   +1   \tab  100   \tab  ...    \tab  3.0 \cr
 }}
 
-\item{StartParam}{(optional) [numeric] vector of parameter values used to start global search calibration procedure (e.g. Calibration_optim)
+\item{StartParam}{(optional) [numeric] vector of parameter values used to start global search calibration procedure
 \cr Example:
 \tabular{llllll}{
               \tab [X1]   \tab [X2]   \tab [X3]   \tab [...]   \tab [Xi] \cr
diff --git a/tests/example_Calibration_optim.R b/tests/example_Calibration_optim.R
deleted file mode 100644
index f08ec410b22eeb0458226509d157e557d5b0f420..0000000000000000000000000000000000000000
--- a/tests/example_Calibration_optim.R
+++ /dev/null
@@ -1,45 +0,0 @@
-## load of catchment data
-require(airGR)
-data(L0123001)
-
-## preparation of InputsModel object
-InputsModel <- CreateInputsModel(FUN_MOD=RunModel_GR4J,DatesR=BasinObs$DatesR,
-                                 Precip=BasinObs$P,PotEvap=BasinObs$E)
-
-## calibration period selection
-Ind_Run <- seq(which(format(BasinObs$DatesR,format="%d/%m/%Y %H:%M")=="01/01/1990 00:00"),
-               which(format(BasinObs$DatesR,format="%d/%m/%Y %H:%M")=="31/12/1999 00:00"))
-
-## preparation of RunOptions object
-RunOptions <- CreateRunOptions(FUN_MOD=RunModel_GR4J,InputsModel=InputsModel,IndPeriod_Run=Ind_Run)
-
-## calibration criterion: preparation of the InputsCrit object
-InputsCrit <- CreateInputsCrit(FUN_CRIT=ErrorCrit_NSE,InputsModel=InputsModel,
-                               RunOptions=RunOptions,Qobs=BasinObs$Qmm[Ind_Run])
-
-## preparation of CalibOptions object
-CalibOptions <- CreateCalibOptions(FUN_MOD=RunModel_GR4J,FUN_CALIB=Calibration_optim)
-
-## calibration
-OutputsCalib <- Calibration_optim(InputsModel=InputsModel,RunOptions=RunOptions,
-                                  InputsCrit=InputsCrit,CalibOptions=CalibOptions,
-                                  FUN_MOD=RunModel_GR4J,FUN_CRIT=ErrorCrit_NSE)
-
-## simulation
-Param <- OutputsCalib$ParamFinalR
-OutputsModel <- RunModel_GR4J(InputsModel=InputsModel,RunOptions=RunOptions,Param=Param)
-
-## results preview
-plot_OutputsModel(OutputsModel=OutputsModel,Qobs=BasinObs$Qmm[Ind_Run])
-
-## efficiency criterion: Nash-Sutcliffe Efficiency
-InputsCrit  <- CreateInputsCrit(FUN_CRIT=ErrorCrit_NSE,InputsModel=InputsModel,
-                                RunOptions=RunOptions,Qobs=BasinObs$Qmm[Ind_Run])
-OutputsCrit <- ErrorCrit_NSE(InputsCrit=InputsCrit,OutputsModel=OutputsModel)
-cat(paste("  Crit  ",OutputsCrit$CritName,"  ",round(OutputsCrit$CritValue,4),"\n",sep=""))
-
-## efficiency criterion: Kling-Gupta Efficiency
-InputsCrit  <- CreateInputsCrit(FUN_CRIT=ErrorCrit_KGE,InputsModel=InputsModel,
-                                RunOptions=RunOptions,Qobs=BasinObs$Qmm[Ind_Run])
-OutputsCrit <- ErrorCrit_KGE(InputsCrit=InputsCrit,OutputsModel=OutputsModel)
-cat(paste("  Crit  ",OutputsCrit$CritName,"  ",round(OutputsCrit$CritValue,4),"\n",sep=""))