diff --git a/src/ctselect/ctselect.cpp b/src/ctselect/ctselect.cpp
index 177bf08..4bc24e2 100644
--- a/src/ctselect/ctselect.cpp
+++ b/src/ctselect/ctselect.cpp
@@ -24,23 +24,153 @@
 #include "ctselect.hpp"
 
 
+/*==========================================================================
+ =                                                                         =
+ =                        Constructors/destructors                         =
+ =                                                                         =
+ ==========================================================================*/
+
+/***********************************************************************//**
+ * @brief Void constructor
+ ***************************************************************************/
+ctselect::ctselect(void) : GApplication(CTSELECT_NAME, CTSELECT_VERSION)
+{
+    // Initialise members
+    init_members();
+
+    // Write header into logger
+    log_header();
+
+    // Return
+    return;
+}
+
+
+/***********************************************************************//**
+ * @brief Command line constructor
+ *
+ * @param[in] argc Number of arguments in command line.
+ * @param[in] argv Array of command line arguments.
+ ***************************************************************************/
+ctselect::ctselect(int argc, char *argv[]) : 
+                    GApplication(CTSELECT_NAME, CTSELECT_VERSION, argc, argv)
+{
+    // Initialise members
+    init_members();
+
+    // Write header into logger
+    log_header();
+
+    // Return
+    return;
+}
+
+
+/***********************************************************************//**
+ * @brief Destructor
+ ***************************************************************************/
+ctselect::~ctselect(void)
+{
+    // Free members
+    free_members();
+
+    // Return
+    return;
+}
+
+
+/*==========================================================================
+ =                                                                         =
+ =                               Operators                                 =
+ =                                                                         =
+ ==========================================================================*/
+
+/*==========================================================================
+ =                                                                         =
+ =                            Public methods                               =
+ =                                                                         =
+ ==========================================================================*/
+
+/***********************************************************************//**
+ * @brief Select event data
+ ***************************************************************************/
+void ctselect::run(void)
+{
+    // Get parameters
+    get_parameters();
+
+    // Write parameters into logger
+    if (logTerse()) {
+        log_parameters();
+        log << std::endl;
+    }
+
+    // Return
+    return;
+}
+
+
+/***********************************************************************//**
+ * @brief Get application parameters
+ *
+ * Get all task parameters from parameter file or (if required) by querying
+ * the user.
+ ***************************************************************************/
+void ctselect::get_parameters(void)
+{
+    // Get parameters
+    m_infile  = par("infile")->value();
+    m_outfile = par("outfile")->value();
+    m_ra      = par("ra")->real();
+    m_dec     = par("dec")->real();
+    m_rad     = par("rad")->real();
+    m_tmin    = par("tmin")->real();
+    m_tmax    = par("tmax")->real();
+    m_emin    = par("emin")->real();
+    m_emax    = par("emax")->real();
+
+    // Return
+    return;
+}
+
+
+/*==========================================================================
+ =                                                                         =
+ =                             Private methods                             =
+ =                                                                         =
+ ==========================================================================*/
+
+/***********************************************************************//**
+ * @brief Initialise class members
+ ***************************************************************************/
+void ctselect::init_members(void)
+{
+    // Initialise members
+    m_infile.clear();
+    m_outfile.clear();
+    m_ra   = 0.0;
+    m_dec  = 0.0;
+    m_rad  = 0.0;
+    m_tmin = 0.0;
+    m_tmax = 0.0;
+    m_emin = 0.0;
+    m_emax = 0.0;
+
+    // Set logger properties
+    log.date(true);
+
+    // Return
+    return;
+}
+
+
 /***********************************************************************//**
- * @brief Application
+ * @brief Delete class members
  ***************************************************************************/
-int ctselect::run(void)
+void ctselect::free_members(void)
 {
-    // Test dump
-    std::cout << *this << std::endl;
-
-    // DUMMY FOR TESTING
-    std::string value;
-    value = par("string")->value();
-    std::cout << value << std::endl;
-    value = par("chatter")->value();
-    std::cout << value << std::endl;
-    value = par("clobber")->value();
-    std::cout << value << std::endl;
+    // Free members
 
     // Return
-    return 0;
+    return;
 }
diff --git a/src/ctselect/ctselect.hpp b/src/ctselect/ctselect.hpp
index 078765d..bf0b1d7 100644
--- a/src/ctselect/ctselect.hpp
+++ b/src/ctselect/ctselect.hpp
@@ -35,13 +35,29 @@
 class ctselect : public GApplication  {
 public:
     // Constructors and destructors
-    ctselect(void) : 
-             GApplication(CTSELECT_NAME, CTSELECT_VERSION) { return; }
-    ctselect(int argc, char *argv[]) : 
-             GApplication(CTSELECT_NAME, CTSELECT_VERSION, argc, argv) { return; }
+    ctselect(void);
+    ctselect(int argc, char *argv[]);
+    ~ctselect(void);
 
     // Methods
-    int run(void);
+    void run(void);
+    void get_parameters(void);
+
+protected:
+    // Protected methods
+    void init_members(void);
+    void free_members(void);
+
+    // User parameters
+    std::string   m_infile;     //!< Input event list
+    std::string   m_outfile;    //!< Output event list
+    double        m_ra;         //!< RA of ROI centre
+    double        m_dec;        //!< DEC of ROI centre
+    double        m_rad;        //!< ROI radius
+    double        m_tmin;       //!< Start time
+    double        m_tmax;       //!< Stop time
+    double        m_emin;       //!< Lower energy
+    double        m_emax;       //!< Upper energy
 };
 
 #endif /* CTSELECT_HPP */