In the business world, the need for the availability
of goods is critical, especially in motorcycle workshops. The
goods availability is related to problems with customer trust,
loss of capital, and storage warehouse capacity. Therefore, the
ability of decision makers to predict the number of sales in the
coming period is essential to be able to determine the
procurement of goods more precisely. There is a method called
Auto-Regressive Integrated Moving Average (ARIMA). This
method is one model that can be used to forecast sales based on
sales time series data in previous periods. The forecasting implementation with the ARIMA model can be done using the Pmdarima 1.1.0 library for Python. The test in this study uses sales data of 62 motorcycle parts from January 2017 to February 2019. Forecasting is done to help decision-makers in determining the amount of procurement of goods to meet the sales of the next three periods.