  We present our analysis of archival Hubble Space Telescope Wide Field
Planetary Camera 2 (WFPC2) observations in F450W (~B) and F555W (~V) of the
intermediate- age populous star clusters NGC 121, NGC 339, NGC 361, NGC 416,
and Kron 3 in the Small Magellanic Cloud. We use published photometry of two
other SMC populous star clusters, Lindsay 1 and Lindsay 113, to investigate the
age sequence of these seven populous star clusters in order to improve our
understanding of the formation chronology of the SMC. We analyzed the V vs
(B-V) and M_V vs (B-V)_0 color-magnitude diagrams of these populous Small
Magellanic Cloud star clusters using a variety of techniques and determined
their ages, metallicities, and reddenings. These new data enable us to improve
the age-metallicity relation of star clusters in the Small Magellanic Cloud. In
particular, we find that a closed-box continuous star-formation model does not
reproduce the age-metallicity relation adequately. However, a theoretical model
punctuated by bursts of star formation is in better agreement with the
observational data presented herein.
