Image forming apparatus, method of controlling the same, program, storage medium, printing system, and method suitable for the printing system

A method of controlling a printing system having first and second control units, the method comprising:

• a first control step of controlling the first control unit to cause a printing unit to perform a first-trial printing of one set of a job requiring printing of a plurality of sets each having a plurality of pages in accordance with a printing condition;
• a second control step of controlling the second control unit to cause the printing unit to perform a second-trial printing of part of plurality of pages of one set of the job in accordance with the printing condition;
• a third control step of controlling the first control unit to cause, if the printing condition is not changed after the first trial-printing is performed, the printing unit to perform printing of remaining set of the plurality of sets not printed by the first trial-printing in accordance with the printing condition, without a user intervention of changing the number of print sets, and cause, if the printing condition is changed after the first trial-printing is performed, the printing unit to perform printing from a first page of the one set of the job in accordance with the changed printing condition, without a user intervention of changing the number of print sets;
• and
• a fourth control step of controlling the second control unit to cause, if the printing condition is changed after the second trial-printing is performed, the printing unit to perform printing from the first page of the one set of the job in accordance with the changed printing condition, without a user intervention of changing the number of print sets, and cause, even if the printing condition is not changed after the second trial-printing is performed, the printing unit to perform printing from the first page of the one set of the job in accordance with the printing condition, without a user intervention of changing the number of print sets.

A non-transitory storage medium computer-readably storing a computer-executable program for controlling a printing system having first and second control units, the computer-executable program comprising:

• a first code that controls the first control unit to cause a printing unit to perform a first trial-printing of-one set of a job requiring printing of a plurality of sets each having a plurality of pages in accordance with a printing condition;
• a second code that controls the second control unit to cause the printing unit to perform a second-trial printing of part of the plurality of pages of one set of the job in accordance with the printing condition;
• a third code that controls the first control unit to cause, if the printing condition is not changed after the first trial-printing is performed, the printing unit to perform printing of remaining set of the plurality of sets not printed by the first trial-printing in accordance with the printing condition, without a user intervention of changing the number of print sets and cause, if the printing condition is changed after the first trial-printing is performed, the printing unit to perform printing from a first page of the one set of the job in accordance with the changed printing condition, without a user intervention of changing the number of print sets;
• and
• a fourth code that controls the second control unit to cause, if the printing condition is changed after the second trial-printing is performed, the printing unit to perform printing from the first page of the one set of the job in accordance with the printing condition, without a user intervention of changing the number of print sets, and cause, even if the printing condition for is not changed after the second trial-printing is performed, the printing unit to perform printing from the first page of the one set of the job in accordance with the printing condition, without a user intervention of chancing the number of print sets.