def compute_approach(power, interest):
    """
    Computes the approach to managing a 
    stakeholder according to the power/interest model.

    Parameters
    ----------
    power : str
        The stakeholder's level of power, either 
        `high` or `low`.

    interest : str
        The stakeholder's level of interest, either 
        `high` or `low`.

    Returns
    -------
    str
        The approach to managing this stakeholder:
        `monitor closely`, `keep satisfied`,
        `keep informed`, `monitor`, or `unknown`.
    """

    if power == "high" and interest == "high":
        return "monitor closely"
    elif power == "high" and interest == "low":
        return "keep satisfied"
    elif power == "low" and interest == "high":
        return "keep informed"
    elif power == "low" and interest == "low":
        return "monitor"
    else:
        return "unknown"