You need to charge percentage of spend or a flat monthly retainer. Percentage of spend usually means 5-15% of spend with a monthly minimum. 10% of $5,000 per month is $500, so decide how much effort a client is. Could be great or could be a nightmare depending on the expectations and how much effort you need.
Integrated Postsecondary Education Data System. Established: The Integrated Postsecondary Education Data System (IPEDS) is a system of interrelated surveys conducted annually by the National Center for Education Statistics (NCES), a part of the Institute for Education Sciences within the United States Department of Education.
IPD is also used to describe the distance between the exit pupils or optical axes of a binocular optical system. Pupillary distance (PD) also describes the distance between the two pupils, but is an optometric term used to specify prescription eyewear. The PD of a patient is used to specify prescriptive eyewear for that patient. The distinction with IPD is the importance of anthropometric databases and the design of binocular viewing devices with an IPD adjustment that will fit a targeted population of users.