Education research design diagram template

flowchart TB
    subgraph P1[Problem]
        direction LR
        A1[Survey current practice] --> A2[Define research questions]
    end
    subgraph P2[Literature and theory]
        direction LR
        B1[Literature review] --> B2[Key concepts] --> B3[Theoretical framework]
    end
    subgraph P3[Research design]
        direction LR
        C1[Select participants] --> C2[Design the intervention] --> C3[Develop instruments]
    end
    subgraph P4[Intervention]
        direction LR
        D1[First action cycle] --> D2[Observe and reflect] --> D3[Revised second cycle]
    end
    subgraph P5[Data analysis]
        direction LR
        E1[Compare pre-test and post-test] --> E2[Analyze interviews and observations]
    end
    subgraph P6[Conclusions]
        direction LR
        F1[Findings] --> F2[Implications for teaching]
    end
    P1 --> P2 --> P3 --> P4 --> P5 --> P6

Draw an education research design diagram with Mermaid flowchart TB syntax. Use six subgraphs for the stages Problem, Literature and theory, Research design, Intervention, Data analysis, and Conclusions. Inside each subgraph use direction LR with two or three steps, and show two action cycles with reflection in the Intervention stage. Connect the stages top to bottom with arrows. Do not use parentheses in node text. Output only the mermaid code block.