Use 'piecemeal' when describing tasks completed in steps over time, rather than all at once. The team developed the software piecemeal, adding features one by one.
Pro Tip 2/3
Partial Completion
Indicates that only parts of something are done, suggesting incompleteness or an ongoing process. The renovation of the old theater is being done piecemeal.
Pro Tip 3/3
Scattered Effort
Suggests work done in an unsystematic or scattered manner, which may not be ideal. The policy changes were implemented piecemeal, causing confusion.