Changes in version 1.8                         

  - The optical function can handle the calibration of a substantial
    number of items (100-200) by grouping them into blocks of 3-5 items
    each.

  - The efficiency function can now provide the efficiency of the
    optimal design compared to a random design for each block.

  - Graphs for the optimal design in each block can now be created using
    the drawdesign function.

  - Convergence plots can be created for each block for monitoring the
    convergence of optimal item calibration algorithm using the
    convergenceplot function.

  - A new function, drawdesign_allitems, has been created to enable
    users to display the optimal calibration design for all items in one
    graph.

  - A new function, calitems, has been introduced to help users
    determine the calibration items to allocate to an examinee based on
    their given ability.