on the part of sb
prep. phr..prep. phr.. done or felt by a specific person or group. You use this to say who is responsible for an action or a feeling.
prep. phr.. attributed to or performed by a specific agent; used to identify the source of an action, attitude, or error within a formal or academic context.
The mistake was due to a lack of care on the part of the driver.
There is a growing desire for change on the part of the local residents.
The success of the peace talks required significant concessions on the part of both governments involved in the dispute.
usually follows a noun (like 'effort', 'mistake', or 'desire') to specify who that noun belongs to.
this phrase is a more formal alternative to using a possessive or 'by'; it is particularly common in reports and academic writing to assign responsibility.
on the part from the manageron the part of the managerthe phrase always uses the preposition 'of' to link to the person or group.