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-====== Tutorial: Combined Hybrid Model ======
-Learning Objectives:
-  * Differences between state model and combinatorial model
-  * Hybrid model
-===== State Model vs. Combinatorial Model =====
-State model and combinatorial model are two most common types of models used in Model-Based Testing (MBT).
-==== State Model ====
-State model is used when you can describe the AUT behavior using a state diagram or finite state machine (FSM).  The sequencer is then used to generate test cases (paths from initial state to final states).
-==== Combinatorial Model ====
-Combinatorial model is typically used to generate test cases to test interactions between/among a set of variables.  The algorithm is then used to generate variable permutations to achieve the desired degree of interaction strength. Most commonly used algorithm is Pairwise.
-==== Which model should I choose? ====
-State model focuses on system behavior while combinatorial model focuses on static variable interaction.
-Often times you may find that in your state model you need to test a set of variable interactions, for example, to test a online web store application, besides testing the navigation between pages, you also need to test all permutations of:
-  * payment types: visa, master, discover, american express, gift card
-  * promotion code: no code/blank, 10% discount code, 20% discount code, ...
-  * product warranty offer: accepted (checked), denied (unchecked)
-  * shipping methods: 2-day, next-day, same-day (rush)
-So state model would be good to generate test cases to navigate web pages while combinatorial model would be good to test permutation of various options at check out page.
-If you find similar situation, the hybrid model by bringing combinatorial model into your state model would allow you to perform both testing in one model.
-===== Hybrid Model =====
-You can embed combinatorial model in a state model as data sets in the state model and reference the data sets in the state model:
-  * create state model
-  * add data sets and generate data table
-  * attach data set to transition or
-  * loop through data set programmatically in scripts
-==== Create State Model ====
-First create a state model with a transition named "checkout", the transition we will use to attach data sets to.  If you need help creating the state model, you may refer to [[state_modeling | Create State Model tutorial]].
-You can also use any of your existing state model as well, just select a transition from the model which we will attach the data sets.
-==== Add Data Sets to Model ====
-Open the state model and select //DATASET// tab. You should see the following:
-{{wiki:overview:tut_DataSet_New.png?800}}
-As shown above, a new data set has been created for us and assigned a default name "NEW_DS_01".
-Let's rename the data set to "PaymentOptions": hover mouse over the data set name:
-{{wiki:overview:tut_DataSet_Rename.png?300}}
-click on the pencil icon to open dataset rename dialog:
-{{wiki:overview:tut_DataSet_RenameDialog.png?300}}
-Enter new data set name "PaymentOptions":
-{{wiki:overview:tut_DataSet_Renamed.png?300}}
-The data set created has no variables, let's proceed to add variables.
-=== Add Variables ===
-As stated earlier, the variables we would like to test all combinations of are:
-  * PaymentType: VISA, MASTER, DISCCOVER, AMERICAN, GIFTCARD
-  * CardNum: 4111-1111-1111-1111 (visa), 5500-0000-0000-0004 (master), 6011-0000-0000-0004(Discover), 3400-0000-0000-009 (American Express), 2123-222-2123 (gift card)
-  * PromoCode: blank, 10%OFF, 20%OFF, $5OFF, 15$OFF
-  * Warranty: true, false
-  * Shipping: 2 (2-day), 1 (next-day), 0 (same-day)
-To add a variable click on "+" button:
-{{wiki:overview:tut_DataSet_AddVar.png?300}}
-and you should see a variable is added:
-{{wiki:overview:tut_DataSet_NewVar.png?200}}
-Go ahead and enter first variable name "PaymentType" in "Name" field and values to be tested in "Domain" field - one value per line as shown below:
-{{wiki:overview:tut_DataSet_VarPaymentType.png?200}}
-Note that the default data type is "text", which is good for "PaymentType".
-Proceed to add the rest of the variables as below - be sure to set the data type accordingly:
-{{wiki:overview:tut_DataSet_AllVars.png?600}}
-==== Attach Data Set to Transition ====
-==== Loop through Data Set ====