### Instruction:

Extract the cause and effect entities from the following sentence:
As the work has a research element, and project decisions will be made based on produced results during the project, it is difficult to estimate precisely how long the development of each stage will take

### Assistant:

KEYWORD: As
VARIABLE: it
CONDITION: is difficult to estimate precisely how long the development of each stage will take
CAUSE_1: the work has a research element
AND: and
CAUSE_2: project decisions will be made based on produced results during the project
EFFECT_1: it is difficult to estimate precisely how long the development of each stage will take

