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\section{Introduction}  The goal of this document is to outline the requirements and goals for the ZTF pipeline.  This is to ensure that ZTF can deliver on the promised science goals. The requirements listed below apply lessons learned from PTF and iPTF to specify what should be possible with ZTF.   In this document we will try to review the current status, precision and accuracy, of the PTF pipeline,  and suggest ways to improve it.  We also provide the list of required pipeline steps, meta data and data products to be stored.  Some of this requirements may have implications to hardware apartus (e.g., flat field screen?),  and some to computing requirements and data storage.  % The goal of this document is to outline  a set of photometric performance requirements, which will ensure that ZTF can deliver on %on  the promised science goals. The requirements listed below apply lessons learned from PTF and iPTF to specify what should be possible %possible  with ZTF.   Some basics goals of ZTF are listed below:  \begin{enumerate}  \item Discovery of Fast, Young, and Rare Transients at near real time (<10min after image arrive to Caltech)  \item Searches for Electromagnetic Counterparts to Gravitational Wave Sources  \item Characterization of Variable Sources Producing high precision light curves for all sources.  \item Asteroid and streaks  Discovery \end{enumerate}