Classic Experimental Design (Before-After Two-Group, Pretest-Posttest Control Group) - Experimental Design that investigates changes over time using pretests and posttests, Posttest Only Control Group Design (Randomized Two Group Design) - Experimental Design where comparisons occur between O1 and O2, Solomon Four-Group Design - Experimental Design that is impractical and expensive. Stronger than Classical Experimental Design for Internal Validity, Delayed Effect Design - For this design to be considered an experimental design, R's are required, pretests are not., Single-Factor Factorial Design - To be considered an experimental design, R's are required. Pretests may also be added to this design. The number of groups must be three or more. One group can be a control group with no X, Two-Factor Factorial Design - To be considered an experimental design, R's are required. Pretests may also be added to this design. X1, X2, Y1 and Y2 can be substituted in this design. The variables X and Y can have more than two groups., Time-Series Design - Quasi-Experimental Design that may have two or more pretests or posttests, Multiple Time-Series Design - Quasi-Experimental Design that may have 2 or more pretests or posttests. The number of pre and posttests must be the same for both groups. Stronger than time-series design, Pre-test Posttest Comparision Group Design (Static Group Design)s - Quasi-Experimental Design that is similar to Classical Experimental Design, this design has dotted lines. Low internal validity because no randomization but external validity is higher as it is tested as people live their normal day to day lives., One-Shot Case Study - Pre-Experimental Design (weak in internal validity, high in external validity), One-Group Pretest-Posttest Design - Pre-experimental Design (weak in internal validity, high in external validity). Stronger than one-shot case study., Posttest Comparision Group Design - Pre-Experimental Design (weak in internal validity, high in external validity). Stronger than one-shot case study and one-group pretest posttest design., Basic Correlational Design - One group. No cause and effect. No X and Y (only if it was experimental or had Rs),

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