def METHOD_NAME(BookID):
    book_file = callToDB(BookID)
    file = readfile(book_file)
    group_by = groupByRequestType(file)
    diff_level = computeDifficultyLevel(group_by)
    filtr_row = filter_row(pivot_table(diff_level),diff_level)
    irt_curve = compute_irt_parameters(filtr_row)
    return(irt_curve)